DOCSLIB.ORG

<I> Rubiaceae</I> 7

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
<I> Rubiaceae</I> 7 Blumea 64, 2019: 23–91 ISSN (Online) 2212-1676 www.ingentaconnect.com/content/nhn/blumea RESEARCH ARTICLE https://doi.org/10.3767/blumea.2019.64.01.02 The tuberous epiphytes of the Rubiaceae 7: a revision of the genus Hydnophytum M.H.P. Jebb1, C.R. Huxley2 Key words Abstract Hydnophytum (Psychotrieae Hydnophytinae) is revised. A key is provided, and an informal infrageneric grouping is proposed. Variation in tuber structure is discussed. Fifty-five species are recognised, of which 19 are Fiji described as new. For one species a number of varieties are also described. Forty-four species are found in New Hydnophytum Guinea, of which 41 are endemic. The recent transfer of a number of taxa into an expanded concept of Squamellaria Malesia based on a molecular phylogeny is addressed. Three taxa of Squamellaria are included in this revision to complete Psychotrieae the series of papers on the tuberous epiphytes of the Rubiaceae. revision Rubiaceae Published on 15 March 2019 Squamellaria INTRODUCTION on Hydnophytum from Leiden, which contains many unpub- lished drawings and descriptions of species he had intended Hydnophytum Jack is the largest of the five genera of tuberous publishing. ant-plants in the subtribe Hydnophytinae (Rubiaceae) (Huxley & Jebb 1991a). The other four genera have been revised (Huxley PHYLOGENETIC CONSIDERATIONS & Jebb 1991b, c, 1993, Jebb 1991b, 1993, Chomicki & Renner 2016). During the revision work, substantial new collections Huxley & Jebb (1991a) formed the subtribe Hydnophytinae to were made in Papua New Guinea; however, major problems still include the five epiphytic myrmecophilous genera of the Psy­ remain with the understanding of the genus in the Indonesian chotrieae. Sohmer (1988) had hypothesized that the Hydno­ archipelago. The taxonomic history of the whole group has been phytinae were derived directly from climbing species of Male- described by Beccari (1884) and Huxley (1993). sian Psychotria L. Based on evidence from DNA sequence Of the 111 species names and 14 subspecific names of Hydno­ variation (e.g., Andersson & Rova 1999, Nepokroeff et al. phytum that have been published, 36 are retained here, while a 1999, Andersson 2002) the Hydnophytinae are monophyletic, further 19 species are described as new. Eleven species remain and are nested within the tribe Psychotrieae. Nepokroeff et al. known from their holotype alone; a problem with a number of (1999) suggested the Hydnophytinae would be better ranked species in New Guinea. Six further species remain inadequately as a subgenus of Psychotria. known, either through loss of the type, or paucity of material, The analysis by Andersson (2002), utilising rps16 (cpDNA) data, and these are retained as ‘little known species’. Five names are identified the Hydnophytinae as belonging to a diverse Pacific excluded from the genus. Apart from Beccari (1884–1886) few clade which excluded Psychotria s.str., but included several authors have illustrated new taxa, and therefore all the species other distinctive genera (Amaracarpus, Calycosia, Dolianthus, have been illustrated here. Straussia and Streblosa). Andersson (2002) concluded that the question of how to treat the Pacific clade taxonomically METHODS remained open, however, as recognising strongly supported groups such as the Hydnophytinae taxonomically leads to This paper is based on morphological characters. The authors consequences for the remaining groups. examined all known collections from the herbaria in A, ABD, Andersson’s work (2002) indicated that Hydnophytum was para- BISH, BM, BO, BRI, BSIP, CANB, CGE, E, F, FHO, FI, FU, phyletic, with the endemic Fijian genus Squamellaria, closely G, GH, K, L, LAE, P, PNH, SING, SUVA, UC, UPNG, US and related to the Fijian taxon H. grandiflorum Becc. Morphology WRSL. Extensive field-based studies, including dissection of of the inflorescence and pollen supports this view. Andersson tubers, were conducted by the authors in Papua New Guinea, (2002) has proposed that all species of the Hydnophytinae Indonesia, and Fiji. Of the 55 species recognised, 25 were ex- are united into the single genus Hydnophytum, since this is amined in the field. The arrangement of synonyms is organised the choice that leads to the smallest number of new combi- chronologically in homotypic paragraphs. All cited specimens nations. Razafimandimbison et al. (2014) using gene trees were examined by the authors unless explicitly indicated as based upon two nuclear and five plastid regions, have recently ‘not seen’ or ‘presumed lost’. We have also had the benefit of made the generic combinations making all the members of the using Theodoric Valeton’s (1855–1929) manuscript material tribe Psychotrieae synonymous with the genus Psychotria. Whilst this creates a monophyletic grouping (with some 4 000 1 National Botanic Gardens, Glasnevin, Dublin 9, Ireland; formerly Depart- taxa), the authors admit that the phylogenetic relationships ment of Plant Sciences, Oxford University, South Parks Road, Oxford, OX1 3RB, UK; corresponding author e-mail: [email protected]. are only partly resolved and continue to be a major challenge 2 Picketts Heath, Ridgeway, Boars Hill, Oxford OX1 5EZ, UK.. (Razafimandimbison et al. 2014). © 2019 Naturalis Biodiversity Center You are free to share - to copy, distribute and transmit the work, under the following conditions: Attribution: You must attribute the work in the manner specified by the author or licensor (but not in any way that suggests that they endorse you or your use of the work). Non-commercial: You may not use this work for commercial purposes. No derivative works: You may not alter, transform, or build upon this work. For any reuse or distribution, you must make clear to others the license terms of this work, which can be found at http://creativecommons.org/licenses/by-nc-nd/3.0/legalcode. Any of the above conditions can be waived if you get permission from the copyright holder. Nothing in this license impairs or restricts the author’s moral rights. 24 Blumea – Volume 64 / 1, 2019 Recently, Chomicki & Renner (2016) have recognised an ex- THE GENUS HYDNOPHYTUM panded concept of Squamellaria, based upon a molecular phylo- geny. Those Hydnophytum species related to the former Squa­ Amongst the Hydnophytinae, the genus Hydnophytum is here mellaria s.str. (Beccari 1885, Jebb 1991b) have been included distinguished on the basis of its 4-merous flowers lacking squa- in a sister clade to all other taxa of the Hydnophytinae (Cho- mules within the corolla, and having an unmodified stem with micki & Renner 2016). The authors acknowledged that there interpetiolar stipules (with the exception of H. mamberamoense is unfortunately no useful morphological character that can Jebb & C.R.Huxley and H. trichomanes Jebb & C.R.Huxley). be used to distinguish the recircumscribed genus other than The remaining genera each have derived characters unique the geographic distribution of these species in the Solomon, to their genus, whereas Hydnophytum is largely devoid of Vanuatu and Fijian Islands (Chomicki & Renner 2016). Whilst apomorphies and is a plesiomorphic, paraphyletic grouping, as removing the predictive value of morphology, this satisfies a confirmed by all molecular studies to date (see above). monophyletic approach to genus recognition in the subtribe. On the criteria of monophyly, morphological diagnosability, and INFRAGENERIC GROUPINGS geographic coherence, the Hydnophytinae and the included genera are of utility, providing a category whereby species In the absence of a complete phylogeny, besides the Squamel­ can be discussed from an ecological, biological or evolutionary laria clade (Chomicki & Renner 2016), an informal infrageneric point of view. Whether this is recognised as a subgenus, or grouping of species was developed because of the number of even an informal category in the future concept of Psychotria species within the genus. Natural divisions are limited in that remains to be seen. they only separate a few groups of species, leaving the remain- Morphological studies of tuber structure have considerably im- der of the genus unresolved. Ten groupings have developed proved generic delimitation within the subtribe. Using characters during the revision, and these provide a useful framework for provided by the study of fresh material, a morphological cladistic examining the genus, and are practical for identifying specimens analysis of the subtribe has been undertaken (Jebb 1985). that prove difficult to key out, since in many cases we have been Morphological insights from tuber and inflorescence structure obliged to use combinations of flower, fruit and pyrene char- in particular suggest that whilst all the remaining genera of acters, which may well be absent from a specimen. Although the Hydnophytinae are derived, Hydnophytum is paraphyletic the majority of these groups can be considered to be more (Jebb 1985, 1991a). The derived genera, namely Anthorrhiza or less natural (1, 2, 3, 4, 7, 9, 10), two groupings are purely C.R.Huxley & Jebb, Myrmecodia Jack, Myrmephytum Becc. and morphological-geographic (5, 6), whilst ten species remain in Squamellaria Becc., appear to be monophyletic themselves, but a mixed bag grouping (8). share no particular affinities to one another. This conclusion is 1) Formicarum group based upon the fact that, unlike Hydnophytum, the four latter 2) Ovatum group genera each embody a characteristic tuber-cavity architecture 3) Petiolatum group and have various derived morphological features of the stems 4) Moseleyanum group which appear to be
Load more

Recommended publications
  • Partner Abundance Controls Mutualism Stability and the Pace of Morphological Change Over Geologic Time
    Partner abundance controls mutualism stability and the pace of morphological change over geologic time Guillaume Chomickia,1 and Susanne S. Rennera aDepartment of Biology, Systematic Botany and Mycology, University of Munich, Munich 80638, Germany Edited by Michael J. Donoghue, Yale University, New Haven, CT, and approved February 23, 2017 (received for review October 17, 2016) Mutualisms that involve symbioses among specialized partners may Ant/plant mutualisms are ubiquitous in tropical ecosystems and be more stable than mutualisms among generalists, and theoretical encompass a wide range of strategies (22–25). In Australasia, the models predict that in many mutualisms, partners exert reciprocal majority of ant-plants are epiphytes and appear to be primarily stabilizing selection on traits directly involved in the interaction. A involved in trophic mutualisms rather than defense mutualisms corollary is that mutualism breakdown should increase morpholog- (22, 24). An epiphytic habit means uneven water and nutrient ical rates of evolution. We here use the largest ant-plant clade supplies (26), and mutualisms with plant-nesting ants that provide (Hydnophytinae), with different levels of specialization for mutual- detritus and feces to their host (27–34) are thus common among istic ant symbionts, to study the ecological context of mutualism epiphytes (22). These mutualistic symbioses range from facultative breakdown and the response of a key symbiosis-related trait, interactions involving many arboreal ant species to obligate in- domatium entrance hole size, which filters symbionts by size. Our teractions that can be species-specific (17, 28, 32, 34, 35). ’ analyses support three predictions from mutualism theory. First, all We here use the world s most species-rich epiphytic ant-plant 12 losses apparently only occur from a generalist symbiotic state.
    [Show full text]
  • Obligate Plant Farming by a Specialized Ant Nature Plants
    Online Supporting Material for Obligate plant farming by a specialized ant Nature Plants Guillaume Chomicki and Susanne Renner Department of Biology, Systematic Botany and Mycology, Menzinger Str. 67, University of Munich (LMU), Munich 80638 Corresponding author: [email protected] (G.C.) Supplementary Materials and Methods Supplementary information on collection of material on Fiji and study sites The study sites in Viti Levu were Colo-i-Suva forest reserve in the south of the island (S 18° 1’ 46.808”, E 178° 24’ 0.4175”) and a forest in the vicinity of Navai in the centre of the island (S 17° 37’ 49.5979”, E 177° 58’ 34.9315”); in Vanua Levu, the collection sites were in Waisali forest reserve (S 16 38’19.8”, E 179 13’19.7”) and along the Cross Island road before the bifurcation to Nabouwalu and Labasa; in Taveuni, the samples (and herbarium collections) were obtained along the trail to DesVoeux peak and Mt. Manuca on the western side of the island (S 16° 48’ 25.8133”, E 179° 56’ 36.6843” ) and at the end of Lavena coastal walk, Bouma heritage park, on the eastern side of the island (S 16° 51’ 45.4433”, E 179° 54’ 6.5149”). All collections were made in collaboration with colleagues from the University of South Pacific (Acknowledgements), and vouchers have been deposited in the herbaria of Suva (SUVA) and Munich (M). For DNA extraction, we collected young leaves and dried them in silica gel. Squamellaria taxonomy follows Chomicki and Renner (2016). Host specificity, occupancy rates Philidris nagasau form large colonies that often occupy several dozen of Squamellaria plants (Fig.
    [Show full text]
  • Recircumscription of the Nepenthes Alata Group (Caryophyllales: Nepenthaceae), in the Philippines, with Four New Species
    European Journal of Taxonomy 69: 1-23 ISSN 2118-9773 http://dx.doi.org/10.5852/ejt.2013.69 www.europeanjournaloftaxonomy.eu 2013 · Martin Cheek & Matthew Jebb This work is licensed under a Creative Commons Attribution 3.0 License. Research article Recircumscription of the Nepenthes alata group (Caryophyllales: Nepenthaceae), in the Philippines, with four new species Martin CHEEK1 & Matthew JEBB2 1 Herbarium, Royal Botanic Gardens, Kew, Richmond, Surrey, TW9 3AE, U.K. Email: [email protected] (corresponding author) 2 National Botanic Garden, Glasnevin, Dublin 9, Ireland Email: [email protected] Abstract. An overview of Nepenthes in the Philippines is presented. Four new species, Nepenthes extincta sp. nov., N. kitanglad sp. nov., N. kurata sp. nov. and N. leyte sp. nov. are described and illustrated from the Philippines and placed in the Nepenthes alata group. An updated circumscription and key to the species of the group is provided. Delimitation and comparison with the Regiae group is given. All four of the newly described species are assessed as threatened using the International Union for the Conservation of Nature 2012 standard, and one, N. extincta sp. nov. is considered likely to be already extinct due to open-cast mining. Logging and conversion of forest habitat are thought to be the main threats to the other three species. Key words. Conservation, Nepenthes alata group, Mindanao, threatened, ultramafic. Cheek M. & Jebb M. 2013. Recircumscription of the Nepenthes alata group (Caryophyllales: Nepenthaceae), in the Philippines, with four new species. European Journal of Taxonomy 69: 1-23. http://dx.doi.org/10.5852/ ejt.2013.69 Introduction This paper forms part of studies towards a World Monograph of Nepenthes L.
    [Show full text]
  • Rubiaceae, Ixoreae
    SYSTEMATICS OF THE PHILIPPINE ENDEMIC IXORA L. (RUBIACEAE, IXOREAE) Dissertation zur Erlangung des Doktorgrades Dr. rer. nat. an der Fakultät Biologie/Chemie/Geowissenschaften der Universität Bayreuth vorgelegt von Cecilia I. Banag Bayreuth, 2014 Die vorliegende Arbeit wurde in der Zeit von Juli 2012 bis September 2014 in Bayreuth am Lehrstuhl Pflanzensystematik unter Betreuung von Frau Prof. Dr. Sigrid Liede-Schumann und Herrn PD Dr. Ulrich Meve angefertigt. Vollständiger Abdruck der von der Fakultät für Biologie, Chemie und Geowissenschaften der Universität Bayreuth genehmigten Dissertation zur Erlangung des akademischen Grades eines Doktors der Naturwissenschaften (Dr. rer. nat.). Dissertation eingereicht am: 11.09.2014 Zulassung durch die Promotionskommission: 17.09.2014 Wissenschaftliches Kolloquium: 10.12.2014 Amtierender Dekan: Prof. Dr. Rhett Kempe Prüfungsausschuss: Prof. Dr. Sigrid Liede-Schumann (Erstgutachter) PD Dr. Gregor Aas (Zweitgutachter) Prof. Dr. Gerhard Gebauer (Vorsitz) Prof. Dr. Carl Beierkuhnlein This dissertation is submitted as a 'Cumulative Thesis' that includes four publications: three submitted articles and one article in preparation for submission. List of Publications Submitted (under review): 1) Banag C.I., Mouly A., Alejandro G.J.D., Meve U. & Liede-Schumann S.: Molecular phylogeny and biogeography of Philippine Ixora L. (Rubiaceae). Submitted to Taxon, TAXON-D-14-00139. 2) Banag C.I., Thrippleton T., Alejandro G.J.D., Reineking B. & Liede-Schumann S.: Bioclimatic niches of endemic Ixora species on the Philippines: potential threats by climate change. Submitted to Plant Ecology, VEGE-D-14-00279. 3) Banag C.I., Tandang D., Meve U. & Liede-Schumann S.: Two new species of Ixora (Ixoroideae, Rubiaceae) endemic to the Philippines. Submitted to Phytotaxa, 4646.
    [Show full text]
  • In the National Botanic Gardens
    As part of the celebration of its Golden Jubilee, The Institute of Biology of Ireland invites you to a keynote Public Lecture* in The National Botanic Gardens (Lecture Theatre), Botanic Rd., Dublin 9 Friday, October 17th 2014, at 7:30pm. Admission: Free Theories, Facts and Mind Games - Enthusing young minds to delight in understanding how lively plants really are Presenter: Dr. Matthew Jebb, Director of the National Botanic Gardens In this lecture Dr Jebb will explore how some of our greatest understandings of the world have come about through simple thought experiments. Not only are these highly informative ways of examining Nature, they are also highly appealing ways of teaching the application of logic in science. Newton, Einstein and Darwin were masters of such clear thinking. Zoology is often seen as easier to teach than Botany because animals are often thought of as more 'alive'. He will also explore some of the fundamental differences between animals and plants, with such questions as 'Why aren't animals photosynthetic?', and 'Do plants have senses?', and will explain why many of these are merely problems of our perception of the world being naturally more animal-centric and trapped in a particular time paradigm. He will use both classic as well as a few new thought experiments to show how the origin of life, the 'intelligence' of plants and the classification of living things are all concepts that can be debated in a logical and lively manner. *Participants will be enabled to engage in discussion and debate with Dr. Jebb during the question and answer session.
    [Show full text]
  • Botanical Classification and Nomenclature an Introduction —
    Botanical classification and nomenclature an introduction — Marc S.M. Sosef Jérôme Degreef Henry Engledow Pierre Meerts Botanical classification and nomenclature an introduction — Marc S.M. Sosef Jérôme Degreef Henry Engledow Pierre Meerts by Marc S.M. Sosef1, Jérôme Degreef1,2, Henry Engledow1 & Pierre Meerts3 1 Meise Botanic Garden, Nieuwelaan 38, B-1860 Meise, Belgium 2 Service Général de l’Enseignement supérieur et de la Recherche scientifique, Fédération Wallonie-Bruxelles, Rue A. Lavallée 1, B-1080 Brussels, Belgium 3 Herbarium et bibliothèque de botanique africaine, Université Libre de Bruxelles, Av. F.D. Roosevelt 50, CP 265, B-1050 Brussels, Belgium Copyright © 2020 Meise Botanic Garden, Nieuwelaan 38, 1860 Meise, Belgium. Printed in Belgium by Gewadrupo, Arendonk. This publication is published and distributed in Open Access under the Creative Commons Attribution 4.0 International license (CC-BY 4.0), which permits use, distribution, and reproduction in any medium, provided the original work is properly cited. A PDF file of this publication can be ordered, free of charge (send an email to [email protected]), or downloaded from the webshop of Meise Botanic Garden at http://shopbotanicgarden.weezbe.com. DOI: 10.5281/zenodo.3706707 CIP Royal Library Albert I, Brussels Botanical classification and nomenclature, an introduction. Marc S.M. Sosef, Jérôme Degreef, Henry Engledow & Pierre Meerts - Meise, Meise Botanic Garden, 2020. - 72 p.; ill.; 22 x 15 cm. ISBN 9789492663207 Subject: Botany D/2020/0325/002 Content Introduction . 5 1. The history of classification . 9 1.1 Theophrastus to the Middle Ages . 11 1.2 Renaissance, Pre-Linnean period . 13 1.3 Linnaeus and the Linnaeans .
    [Show full text]
  • Flora Malesiana Nepenthaceae
    Flora Malesiana Series I - Seed Plants Volume 15 - 2001 Nepenthaceae Martin Cheek & Matthew Jebb ISBN 90-71236-49-8 All rights reserved © 2001 FoundationFlora Malesiana No the this be in part of material protected by copyright notice may reproduced or utilized any electronic form or by any means, or mechanical, including photocopying, recording, or by any and retrieval without written the information storage system, permission from copyright owner. Abstract Flora Malesiana. Series I, Volume 15 (2001) iv + 1—157, published by the Nationaal Herbarium Nederland, Universiteit Leiden branch, The Netherlands, under the aus- pices of FoundationFlora Malesiana. ISBN 90-71236-49-8 for i.e. the Contains the taxonomicrevision ofone family, Nepenthaceae, Malesia, area covering the countries Indonesia, Malaysia, Brunei Darussalam, Singapore, the Philip- pines, and Papua New Guinea. Martin Cheek & Matthew Jebb, Nepenthaceae, pp. 1—157*. A palaeotropical family of lianas, shrubs and herbs, with a single genus, Nepenthes. three There are 83 species of the family in the Malesian area, including nothospecies and one little known species. Most of the species are cultivated and traded across the value. in world as ornamental plants with curiosity Locally Malesia, some species are used for cooking specialist rice dishes, for medicinal uses or for making rope. habitat and ecol- The introductory part consists of chapters on distribution, fossils, ogy, reproductive biology, morphology and anatomy, pitcher function, cytotaxonomy, and characters. conservation, taxonomy, uses, collecting notes, spot Regional keys to the species are given. These are based largely on vegetative charac- ters. distribution, notes Foreach species full references, synonymy, descriptions, ecology, on diagnostic characters and relationships withother species are presented.
    [Show full text]
  • Evolutionary Time for Dispersal Limits the Extent but Not the Occupancy of Species’ Potential Ranges in the Tropical Plant Genus Psychotria (Rubiaceae) John R
    The University of San Francisco USF Scholarship: a digital repository @ Gleeson Library | Geschke Center Biology Faculty Publications Biology 2009 Evolutionary Time for Dispersal Limits the Extent but Not the Occupancy of Species’ Potential Ranges in the Tropical Plant Genus Psychotria (Rubiaceae) John R. Paul University of San Francisco, [email protected] Cynthia Morton Charlotte M. Taylor Stephen J. Tonsor Follow this and additional works at: http://repository.usfca.edu/biol_fac Part of the Biology Commons Recommended Citation Paul JR, Morton C, Taylor CM, Tonsor SJ. Evolutionary time for dispersal limits the extent but not the occupancy of species' potential ranges in the tropical plant genus Psychotria (Rubiaceae). Am Nat. 2009 Feb;173(2):188-99. This Article is brought to you for free and open access by the Biology at USF Scholarship: a digital repository @ Gleeson Library | Geschke Center. It has been accepted for inclusion in Biology Faculty Publications by an authorized administrator of USF Scholarship: a digital repository @ Gleeson Library | Geschke Center. For more information, please contact [email protected]. vol. 173, no. 2 the american naturalist february 2009 ൴ Evolutionary Time for Dispersal Limits the Extent but Not the Occupancy of Species’ Potential Ranges in the Tropical Plant Genus Psychotria (Rubiaceae) John R. Paul,1,* Cynthia Morton,2 Charlotte M. Taylor,3 and Stephen J. Tonsor1 1. Department of Biological Sciences, University of Pittsburgh, Pittsburgh, Pennsylvania 15260; 2. Section of Botany, Carnegie Museum of Natural History, Pittsburgh, Pennsylvania 15213; 3. Missouri Botanical Garden, P.O. Box 299, St. Louis, Missouri 63166 Submitted May 5, 2008; Accepted September 29, 2008; Electronically published January 13, 2009 Online enhancement: appendixes.
    [Show full text]
  • Caryophyllales: Nepenthaceae), in the Philippines, with Four New Species
    European Journal of Taxonomy 69: 1-23 ISSN 2118-9773 http://dx.doi.org/10.5852/ejt.2013.69 www.europeanjournaloftaxonomy.eu 2013 · Martin Cheek & Matthew Jebb This work is licensed under a Creative Commons Attribution 3.0 License. Research article Recircumscription of the Nepenthes alata group (Caryophyllales: Nepenthaceae), in the Philippines, with four new species Martin CHEEK1 & Matthew JEBB2 1 Herbarium, Royal Botanic Gardens, Kew, Richmond, Surrey, TW9 3AE, U.K. Email: [email protected] (corresponding author) 2 National Botanic Garden, Glasnevin, Dublin 9, Ireland Email: [email protected] Abstract. An overview of Nepenthes in the Philippines is presented. Four new species, Nepenthes extincta sp. nov., N. kitanglad sp. nov., N. kurata sp. nov. and N. leyte sp. nov. are described and illustrated from the Philippines and placed in the Nepenthes alata group. An updated circumscription and key to the species of the group is provided. Delimitation and comparison with the Regiae group is given. All four of the newly described species are assessed as threatened using the International Union for the Conservation of Nature 2012 standard, and one, N. extincta sp. nov. is considered likely to be already extinct due to open-cast mining. Logging and conversion of forest habitat are thought to be the main threats to the other three species. Key words. Conservation, Nepenthes alata group, Mindanao, threatened, ultramafi c. Cheek M. & Jebb M. 2013. Recircumscription of the Nepenthes alata group (Caryophyllales: Nepenthaceae), in the Philippines, with four new species. European Journal of Taxonomy 69: 1-23. http://dx.doi.org/10.5852/ ejt.2013.69 Introduction This paper forms part of studies towards a World Monograph of Nepenthes L.
    [Show full text]
  • Partner Abundance Controls Mutualism Stability and the Pace of Morphological Change Over Geologic Time
    Partner abundance controls mutualism stability and the pace of morphological change over geologic time Guillaume Chomickia,1 and Susanne S. Rennera aDepartment of Biology, Systematic Botany and Mycology, University of Munich, Munich 80638, Germany Edited by Michael J. Donoghue, Yale University, New Haven, CT, and approved February 23, 2017 (received for review October 17, 2016) Mutualisms that involve symbioses among specialized partners may Ant/plant mutualisms are ubiquitous in tropical ecosystems and be more stable than mutualisms among generalists, and theoretical encompass a wide range of strategies (22–25). In Australasia, the models predict that in many mutualisms, partners exert reciprocal majority of ant-plants are epiphytes and appear to be primarily stabilizing selection on traits directly involved in the interaction. A involved in trophic mutualisms rather than defense mutualisms corollary is that mutualism breakdown should increase morpholog- (22, 24). An epiphytic habit means uneven water and nutrient ical rates of evolution. We here use the largest ant-plant clade supplies (26), and mutualisms with plant-nesting ants that provide (Hydnophytinae), with different levels of specialization for mutual- detritus and feces to their host (27–34) are thus common among istic ant symbionts, to study the ecological context of mutualism epiphytes (22). These mutualistic symbioses range from facultative breakdown and the response of a key symbiosis-related trait, interactions involving many arboreal ant species to obligate in- domatium entrance hole size, which filters symbionts by size. Our teractions that can be species-specific (17, 28, 32, 34, 35). ’ analyses support three predictions from mutualism theory. First, all We here use the world s most species-rich epiphytic ant-plant 12 losses apparently only occur from a generalist symbiotic state.
    [Show full text]
  • WOOD ANATOMY of the PREDOMINANTLY AFRICAN REPRESENTATIVES of the TRIBE PSYCHOTRIEAE (RUBIACEAE-RUBIOIDEAE) Steven Janseni , Elma
    lAWA Journal, Vol. 18 (2),1997: 169-196 WOOD ANATOMY OF THE PREDOMINANTLY AFRICAN REPRESENTATIVES OF THE TRIBE PSYCHOTRIEAE (RUBIACEAE-RUBIOIDEAE) by Steven Jansen i , Elmar Robbrecht2, Hans Beeckman3 & Erik Smets i SUMMARY Wood samples of representatives of Chassalia, Chazaliella, Gaertnera, Hymenocoleus, Pagamea and Psycho tria are examined. The generic delimitation of these predominantly African Psychotrieae, which is main­ ly based on fruit morphology, is compared with wood anatomical vari­ ation patterns. Part of the variation observed is related to habit, e. g. wide vessels in the tree species Psychotria dermatophylla. Other features do have systematic significance, as shown by a cluster analysis of the data obtained. The genus pair GaertneralPagamea differs obviously from the other genera and is wood anatomically clearly distinguished by the presence of fibre-tracheids and parenchyma bands. Chassalia, Chazali­ ella, Hymenocoleus and Psychotria have rather similar wood structure, although variation in vessel diameter, vessel arrangement, ray composi­ tion and axial parenchyma occurs. Several uncommon features are re­ corded: the presence of few to numerous openings in one oblique perforation plate, irregular reticulate perforation plates and multiple vessel-ray perforations with marked irregularity. Key words: African Psychotrieae, systematic wood anatomy, taxon­ omy, Rubiaceae. INTRODUCTION Although the Rubiaceae rank as the fourth largest angiosperm family and more than 80% of its genera are woody (Robbrecht 1988), the xylotomy of the family is under­ explored. Wood anatomy of the family has systematically been studied by Janssonius (1926) and by Koek-Noorman from 1969 onwards. The latter author clearly demon­ strated the taxonomic value of rubiaceous wood at the tribal level (Koek-Noorman 1977).
    [Show full text]
  • Evolutionary Relationships and Biogeography of the Ant-Epiphytic Genus Squamellaria (Rubiaceae: Psychotrieae) and Their Taxonomic Implications
    RESEARCH ARTICLE Evolutionary Relationships and Biogeography of the Ant-Epiphytic Genus Squamellaria (Rubiaceae: Psychotrieae) and Their Taxonomic Implications Guillaume Chomicki*, Susanne S. Renner Systematic Botany and Mycology, University of Munich (LMU), Menzinger Str. 67, 80638, Munich, Germany * [email protected] Abstract Ecological research on ant/plant symbioses in Fiji, combined with molecular phylogenetics, has brought to light four new species of Squamellaria in the subtribe Hydnophytinae of the Rubiaceae tribe Psychotrieae and revealed that four other species, previously in Hydno- OPEN ACCESS phytum, need to be transferred to Squamellaria. The diagnoses of the new species are Citation: Chomicki G, Renner SS (2016) based on morphological and DNA traits, with further insights from microCT scanning of flow- Evolutionary Relationships and Biogeography of the ers and leaf δ13C ratios (associated with Crassulacean acid metabolism). Our field and phy- Ant-Epiphytic Genus Squamellaria (Rubiaceae: Psychotrieae) and Their Taxonomic Implications. logenetic work results in a new circumscription of the genus Squamellaria, which now PLoS ONE 11(3): e0151317. doi:10.1371/journal. contains 12 species (to which we also provide a taxonomic key), not 3 as in the last revision. pone.0151317 A clock-dated phylogeny and a model-testing biogeographic framework were used to infer Editor: William Oki Wong, Institute of Botany, CHINA the broader geographic history of rubiaceous ant plants in the Pacific, specifically the suc- Received: December 2, 2015 cessive expansion of Squamellaria to Vanuatu, the Solomon Islands, and Fiji. The coloniza- tion of Vanuatu may have occurred from Fiji, when these islands were still in the same Accepted: February 25, 2016 insular arc, while the colonization of the Solomon islands may have occurred after the sepa- Published: March 30, 2016 ration of this island from the Fiji/Vanuatu arc.
    [Show full text]