cryptogamie Bryologie 2020 ● 41 ● 15 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 : Extraits d’éléments de la Figure 3 / Extracts of the Figure 3 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, 2020 ISSN (imprimé / print) : 1290-0796 / ISSN (électronique / electronic) : 1776-0992 An evaluation of the endemic bryophyte flora of Guadeloupe S. Robbert GRADSTEIN Muséum National d’Histoire Naturelle – Sorbonne Universités, Institut de Systématique, Évolution, Biodiversité (UMR 7205), BP 39, 57 rue Cuvier, 75005 Paris (France) [email protected] (corresponding author) Elisabeth LAVOCAT BERNARD 5, lotissement Moreau, 97128 Goyave, Guadeloupe, F.W.I. Corresponding member of the Muséum National d’Histoire Naturelle, Institut de Systématique, Évolution, Biodiversité, 75005 Paris (France) [email protected] Submitted on 8 May 2020 | Accepted on 11 September 2020 | Published on 14 October 2020 Gradstein S. R. & Lavocat Bernard E. 2020. — An evaluation of the endemic bryophyte flora of Guadeloupe. Cryp- togamie, Bryologie 41 (15): 205-214. https://doi.org/10.5252/cryptogamie-bryologie2020v41a15. http://cryptogamie. com/bryologie/41/15 ABSTRACT The Guadeloupe archipelago has a rich bryophyte flora with 633 species, including 19 species con- sidered endemic to Guadeloupe. Most of the endemic species are only known from type material and are of doubtful taxonomic status. An examination of the types and literature leads to the recogni- KEY WORDS tion of three confirmed endemic species in the Guadeloupe archipelago: Frullania trigona L.Clark, Confirmed endemics, Jovet-Ast & Frye, Riccardia innovans (Steph.) Pagán and Trichosteleum glaucinum (Besch.) A.Jaeger. geographical distribution, rejected endemics, All three are very rare and only known from the type. Field searches to locate further populations Frullania trigona, were unsuccesful. The remaining “endemic” species are not restricted to Guadeloupe and most of Riccardia innovans, them are synonyms of widely distributed taxa. Nine new synonyms and four new lectotypifications Trichosteleum glaucinum, lectotypifications, are proposed. The study shows that bryophyte endemism in the Guadeloupe archipelago is 0.5%. Guadeloupe. The results confirm the notion that endemism in bryophytes is low. CRYPTOGAMIE, BRYOLOGIE • 2020 • 41 (15) © Publications scientifiques du Muséum national d’Histoire naturelle, Paris. www.cryptogamie.com/bryologie 205 Gradstein S. R. & Lavocat Bernard E. RÉSUMÉ Évaluation de la bryoflore endémique de la Guadeloupe. L’archipel de la Guadeloupe possède une bryoflore riche avec 633 espèces, dont 19 espèces considérées comme endémiques de la Guadeloupe. La plupart des espèces endémiques ne sont connues que par leur échantillon type et sont de statut taxonomique douteux. Un examen des types et de la littérature a permis de reconnaître trois espèces endémiques dans l’archipel de la Guadeloupe: Frullania trigona MOTS CLÉS L.Clark, Jovet-Ast & Frye, Riccardia innovans (Steph.) Pagán et Trichosteleum glaucinum (Besch.) Endémiques confirmées, A.Jaeger. Ces trois espèces sont très rares et ne sont connues que de leur type. Les recherches sur le distribution géographique, endémiques rejetées, terrain pour localiser d’autres populations n’ont pas abouti. Les autres espèces signalées comme endé- Frullania trigona, miques s’avèrent non limitées à la Guadeloupe ; la plupart d’entre elles sont des synonymes de taxons Riccardia innovans, largement répandus. Neuf nouveaux synonymes et quatre nouvelles lectotypifications sont proposés. Trichosteleum glaucinum, lectotypifications, L’étude montre que l’endémisme des bryophytes dans l’archipel Guadeloupéen est de 0,5 %. Les Guadeloupe. résultats confirment le faible taux d’endémisme chez les bryophytes. INTRODUCTION citations and full bibliographic references are provided for all species except for those treated as synonyms in recent taxo- The Guadeloupe archipelago has a rich bryophyte flora with nomic revisions. The Guadeloupe archipelago is for brevity 633 recorded species (Lavocat Bernard & Schäfer-Verwimp referred to as “Guadeloupe”. 2011; Lavocat Bernard & Reeb 2016). The majority of the species occurs on the main island, Guadeloupe, which is CONFIRMED ENDEMICS ecologically highly diverse and reaches to 1467 m on the active volcano La Soufrière, constituting the highest eleva- Family FRULLANIACEAE Lorch tion in the Lesser Antilles. Many species have been described Genus Frullania Raddi from the Guadeloupe archipelago and Lavocat Bernard & Schäfer-Verwimp (2011) listed 19 bryophyte species as being Frullania trigona L.Clark, Jovet-Ast & Frye endemic to the archipelago, including Cheilolejeunea falcata (Figs 1, 4) Steph., Cheilolejeunea ovistipula Steph., Drepanolejeunea valiae Jovet-Ast, Frullania guadalupensis Steph., Frullania minima The Bryologist 50: 52 (1947). — Type: Guadeloupe, Traces Steph., Frullania trigona L.Clark, Jovet-Ast & Frye, Frullania Hugues, “sur branchettes”, P. & V. Allorge s.n. (iso-, PC[PC0102212, urbanii Steph., Harpalejeunea herzogii Jovet-Ast, Plagiochila PC0102211 (slide)]!). desciscens Steph., Plagochila germani Steph., Plagiochila her- minieri Steph., Plagiochila saxicola Steph., Radula subsimplex Remarks Steph., Rectolejeunea dussii Steph. (synonym of Cheilolejeunea Frullania trigona is a member of subg. Frullania sect. Microphyl- dussii Steph. nom. inval.), Riccardia innovans (Steph.) Pagán, lae (R.M.Schust.) Gradst., Lima & Ilk.-Borg., a small group Taxilejeunea irregularis Steph., Taxilejeunea linguaefolia Steph., of about ten species including three in the Neotropics (Lima Megaceros solidus Steph. and Trichosteleum glaucinum (Besch.) et al. 2020). Characteristic of this section are the small, dioicous A.Jaeger. Most of them, however, are only known from the plants, less than 1 mm wide, with caducous leaf lobes, ocelli in type and, as noted by Lavocat Bernard & Schäfer-Verwimp leaf lobes (and sometimes in underleaves), and small, distant (2011), their taxonomic status is usually doubtful and in underleaves. Within this group, F. trigona stands out by scattered need of verification. ocelli in leaves but not in underleaves, margins of leaves and The purpose of this paper is to verify the taxonomic status underleaves distantly crenulate by projecting trigones, underleaves of the endemic bryophytes of Guadeloupe archipelago based scarcely wider than the stem, and female bracts and bracteoles on the study of types, literature and fieldwork. with entire margins. The species is only known from the type. RESULTS AND DISCUSSION Family ANEURACEAE H. Klinggr. Genus Riccardia Gray The species recorded as endemic to the Guadeloupe archipelago are treated in alphabetical order, in two sections: confirmed Riccardia innovans (Steph.) Pagán endemics and rejected endemics. Confirmed endemics include (Figs 2-4) species that are only known from Guadeloupe and are accepted here as good taxa. Rejected endemics, on the other hand, have The Bryologist 45: 80 (1942). — Basionym: Aneura innovans wider ranges and are not restricted