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Cryptogamie Bryologie 2021 ● 42 ● 2 Directeur De La Publication / Publication Director : Bruno David, Président Du Muséum National D’Histoire Naturelle

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Cryptogamie Bryologie 2021 ● 42 ● 2 Directeur De La Publication / Publication Director : Bruno David, Président Du Muséum National D’Histoire Naturelle cryptogamie Bryologie 2021 ● 42 ● 2 DIRECTEUR DE LA PUBLICATION / PUBLICATION DIRECTOR : Bruno David, Président du Muséum national d’Histoire naturelle RÉDACTEUR EN CHEF / EDITOR-IN-CHIEF : Denis LAMY ASSISTANTE DE RÉDACTION / ASSISTANT EDITOR : Marianne SALAÜN ([email protected]) MISE EN PAGE / PAGE LAYOUT : Marianne SALAÜN RÉDACTEURS ASSOCIÉS / ASSOCIATE EDITORS Biologie moléculaire et phylogénie / Molecular biology and phylogeny Bernard GOFFINET Department of Ecology and Evolutionary Biology, University of Connecticut (United States) Mousses d’Europe / European mosses Isabel DRAPER Centro de Investigación en Biodiversidad y Cambio Global (CIBC-UAM), Universidad Autónoma de Madrid (Spain) Francisco LARA GARCÍA Centro de Investigación en Biodiversidad y Cambio Global (CIBC-UAM), Universidad Autónoma de Madrid (Spain) Mousses d’Afrique et d’Antarctique / African and Antarctic mosses Rysiek OCHYRA Laboratory of Bryology, Institute of Botany, Polish Academy of Sciences, Krakow (Pologne) Bryophytes d’Asie / Asian bryophytes Rui-Liang ZHU School of Life Science, East China Normal University, Shanghai (China) Bioindication / Biomonitoring Franck-Olivier DENAYER Faculté des Sciences Pharmaceutiques et Biologiques de Lille, Laboratoire de Botanique et de Cryptogamie, Lille (France) Écologie des bryophytes / Ecology of bryophyte Nagore GARCÍA MEDINA Department of Biology (Botany), and Centro de Investigación en Biodiversidad y Cambio Global (CIBC-UAM), Universidad Autónoma de Madrid (Spain) COUVERTURE / COVER : Schistochila gradsteinii sp. nov. photo by Louis Thouvenot. Cryptogamie, Bryologie est indexé dans / Cryptogamie, Bryologie is indexed in: – Biological Abstracts – Current Contents – Science Citation Index – Publications bibliographiques du CNRS (Pascal). Cryptogamie, Bryologie est distribué en version électronique par / Cryptogamie, Bryologie is distributed electronically by: – BioOne® (http://www.bioone.org) Cryptogamie, Bryologie est une revue en flux continu publiée par les Publications scientifiques du Muséum, Paris Cryptogamie, Bryologie is a fast track journal published by the Museum Science Press, Paris Les Publications scientifiques du Muséum publient aussi / The Museum Science Press also publish: Adansonia, Geodiversitas, Zoosystema, Anthropozoologica, European Journal of Taxonomy, Naturae, Comptes Rendus Palevol, Cryptogamie sous-sections Algologie, Mycologie. Diffusion – Publications scientifiques Muséum national d’Histoire naturelle CP 41 – 57 rue Cuvier F-75231 Paris cedex 05 (France) Tél. : 33 (0)1 40 79 48 05 / Fax : 33 (0)1 40 79 38 40 [email protected] / http://sciencepress.mnhn.fr © Publications scientifiques du Muséum national d’Histoire naturelle, Paris, 2021 ISSN (imprimé / print) : 1290-0796 / ISSN (électronique / electronic) : 1776-0992 Schistochila gradsteinii sp. nov., a new species from New Caledonia related to S. vitreocincta (Schistochilaceae, Marchantiophyta), with a key to the local species and a description of the gynoecium of S. integerrima Louis THOUVENOT 11 rue Saint Léon, F-66000 Perpignan (France) [email protected] Submitted on 20 April 2020 | Accepted on 26 January 2021 | Published on 12 February 2021 Thouvenot L. 2021. — Schistochila gradsteinii sp. nov., a new species from New Caledonia related to S. vitreocincta (Schistochilaceae, Marchantiophyta), with a key to the local species and a description of the gynoecium of S. in- tegerrima. Cryptogamie, Bryologie 42 (2): 11-18. https://doi.org/10.5252/cryptogamie-bryologie2021v42a2. http:// cryptogamie.com/bryologie/42/2 ABSTRACT Schistochila gradsteinii Thouvenot sp. nov., is added to the fiveSchistochila Dumort. species formerly known in New Caledonia. The new species is distinctive by the lack of underleaves, bilobed leaves entire margined, with larger ventral lobes oblong-lanceolate to oblong-ovate, apiculate, dorsal lobes KEY WORDS Schistochilaceae, oblong-ovate, inserted on the dorsal surface of ventral lobes, the free margins not reaching the ventral liverworts, margins, leaf cells with seemingly 3-layered trigones, stems with a conspicuous epidermis. It shares New Caledonia, with the endemic S. vitreocincta (Herzog) X.L.He & Glenny some features distinctive from the rest morphology, Perssoniella, of the genus. In addition, the occurrence of S. vitreocincta is clarified, the gynoecium of S. integerrima new species. Steph. is newly described and a key to the New Caledonian species of Schistochila is provided. RÉSUMÉ Schistochila gradsteinii sp. nov., une nouvelle espèce néocalédonienne apparentée à S. vitreocincta (Schistochilaceae, Marchantiophyta), avec une clé des espèces locales et une description du gynoecium de S. integerrima. Schistochila gradsteinii Thouvenot sp. nov., est ajoutée aux cinq espèces de Schistochila Dumort. déjà connues de Nouvelle-Calédonie. La nouvelle espèce se distingue par l’absence d’amphigastre, des feuilles bilobées aux marges entières, avec des lobes ventraux plus grands, oblong-lancéolés ou oblong-ovales, apiculés, des lobes dorsaux oblong-ovales, insérés sur la surface dorsale des lobes ventraux, les marges MOTS CLÉS Schistochilaceae, libres n’atteignant pas les marges ventrales, cellules foliaires avec des trigones apparemment constitués hépatiques, de trois couches, des tiges avec un net epiderme. Elle partage avec l’endémique S. vitreocincta (Herzog) Nouvelle-Calédonie, X.L.He & Glenny plusieurs caractères les distinguant du reste du genre. En supplément, l’occurrence morphologie, Perssoniella, de S. vitreocincta est affinée, le gynoecium deS. integerrima Steph. est nouvellement décrit et une clé espèce nouvelle. des espèces néocalédoniennes de Schistochila est donnée. CRYPTOGAMIE, BRYOLOGIE • 2021 • 42 (2) © Publications scientifiques du Muséum national d’Histoire naturelle, Paris. www.cryptogamie.com/bryologie 11 Thouvenot L. INTRODUCTION Specimen gatherings were made with the following col- lecting permits of North Province (number 60912-2012, The genus Schistochila Dumort. in New Caledonia includes five 60912-1275-2016, 609011-45-2019) and South Province species (Thouvenotet al. 2011): two endemics, S. caledonica Environment Departments (number 1238-2012, 794-2016, Steph. and S. vitreocincta (Herzog) X.L.He & Glenny as well 2825-2019). as S. integerrima Steph., also present in Vanuatu, S. sciurea (Bees) Schiffn. (Asia, Melanesia) and the widely distributed Schistochila aligera (Nees & Blume) J.B.Jack & Steph. (Asia, RESULTS Melanesia, Australasia). The family Schistochilaceae Buch includes currently a single genus but several other combi- Family SCHISTOCHILACEAE H. Buch nations were published before (for a review, see He et al. Genus Schistochila Dumort. 2014) to accommodate the morphological diversity of these plants. Especially concerned in the New Caledonian context, Schistochila vitreocincta (Herzog) X.L.He & Glenny. are the following taxa. On the one hand, Paraschistochila R.M.Schust., created by Schuster (1963) to accommodate Australian Systematic Botany 23: 237 (2010). species lacking underleaves, was later on included in Gotts- chea Nees ex Mont. by Grolle & Zijlstra (1984). On the COMMENTS other hand, the monotypic genus Perssoniella Herzog was Several expeditions in New Caledonia since 2008 increased created by Herzog (1952) for the New Caledonian endemic our knowledge of the repartition of S. vitreocincta that Perssoniella vitreocincta Herzog. This species exhibits such Schuster (1964) described as limited to a few localities, in outstanding features that Schuster (1963, 1964) introduced the vicinity of Montagne des Sources. In fact, the claim a new family, Perssoniellaceae R.M.Schust., and the new of this author that “the genus (Perssoniella) is seemingly suborder Perssoniellinae R.M.Schust. These two genera were restricted to the Araucaria-Agathis zone in the montane later transferred to Schistochila by He & Glenny (2010), but portions of southwestern New Caledonia” is partly true but further publications (Sun et al. 2014; Engel & Glenny 2019) S. vitreocincta is more frequent that then presumed. In this provide arguments for them to be kept as valid genera. In area, which corresponds to the southern ultramafic mas- the phylogeny of Sun et al. (2014), Perssoniella is sister to sif, this species grows on the barks of many large trunks of Gottschea and “is on a very long branch from the base of the Araucariaceae species and was observed in elevations from Gottschea clade”. But the estimated date of this divergence, 200 m to 1400 m. 67 Mya, is inconsistent to the geological history of New Caledonia which was undergoing a long submersion until 37 Mya ago (Grandcolas et al. 2008). Schistochila integerrima Steph. Here we describe a new species which share important features with Schistochila vitreocincta but, in the limits of Species Hepaticarum 6: 492 (1924). the present work, we cannot add molecular arguments for SPECIMEN EXAMINED. — New Caledonia. North Province, Poin- generic reinstatement. So that, in the present paper we dimié, Amoa valley, trail to Goro Até Mèkébo, on trunks in cloud follow the broadly defined concept ofSchistochila as used forest, 724 m, 12.X.2019, Thouvenot NC2825(PC[PC0712101]). in the recent world checklist of liverworts (Söderström et al. 2016). COMMENTS Among the Schistochila species lacking underleaves (formerly regarded as Gottschea Nees ex Mont.) and with entire mar- gined leaves, S. integerrima is easily distinguished from spe- MATERIAL AND METHOD cies with subequal lobes and inflated keels (see below) by the insertion of the dorsal lobes on
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