[en] Background and aims – Lethocolea (Acrobolbaceae) is a small liverwort genus of seven species distributed in temperate regions of the Southern Hemisphere and on tropical mountains. The taxonomic history of the genus has been chaotic, the species were described under many different names and have been distinguished mainly based on geography. Here, we undertook a taxonomic revision of the genus based on a reassessment of morphological characters and a molecular analysis. Material and methods – Type material and additional collections from 17 herbaria were examined in the morphological study. Sequences of the rps4 chloroplast region and maximum likelihood analyses were used to reconstruct the phylogeny. Key results and conclusions – Two fully supported clades were resolved within Lethocolea lending support to the recognition of two subgenera, subgen. Lethocolea and subgen. Symphyomitra. Lethocolea congesta from Africa, and L. glossophylla and L. radicosa from America exhibited considerable morphological overlap and were not distinguishable based on rps4 sequences. The latter two species are reduced into synonymy with L. congesta, whose range spans across Africa, the Neotropics and southern South America. In Australasia, where only one species, L. pansa, is recognized, two morphotypes were found. The first one, with a smooth cuticle, wingless gemmae, and leaf cells without trigones, is identical to the type of L. pansa and occurs in Australia and New Zealand. In addition, the species is newly reported from South Africa. The second morphotype has a papillose cuticle, winged gemmae, and leaf cells with distinct trigones, and is assigned to L. javanica, which ranges across Australasia and furthermore occurs in Java and India. The recognition of these two species is supported by molecular analysis. Altogether, we recognize four species within Lethocolea, which are thoroughly described, illustrated, and keyed. We present 12 new lectotypifications.
Gradstein, S. Robbert ; Meise Botanic Garden, Meise, Belgium
Ilkiu-Borges, Anna Luiza ; Museu Paraense Emílio Goeldi, Coordenação de Botânica, Belém, Brazil
Cargill, D. Christine ; Australian National Herbarium, Centre for Australian National Biodiversity Research, Canberra, Australia
Beckmann, Karen; Monbulk, Australia
Vanderpoorten, Alain ; Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Biologie de l'évolution et de la conservation - Unité aCREA-Ulg (Conseils et Recherches en Ecologie Appliquée)
Language :
English
Title :
An integrative taxonomic study of the genus Lethocolea (Marchantiophyta: Acrobolbaceae)
We thank the curators of the following herbaria for the loan of specimens: BOL, BM, FH, G, JE, MANCH, MO, NY, PRE, QCA, and U. We furthermore express our gratitude to Claudine Ah-Peng (R\u00E9union), Lisa Lavocat-Bernard (Guadeloupe), Juan Larrain (Concepci\u00F3n), Tam\u00E1s P\u00F3cs (Eger), and Alfons Sch\u00E4fer-Verwimp (Sch\u00F6nach-Herdwangen) for sending recently collected materials of Lethocolea congesta, to Cornelia Klak (Cape Town) for information on the type of Symphyomitra tabularis, to Christine Cocquyt (Meise Botanic Garden) for images of oil bodies of L. congesta, and to John Brinda (St. Louis) for nomenclatural advice. The first author is grateful to Michelle Price (Geneva), Mark Appelhans (G\u00F6ttingen), J\u00F6rn Hentschel (Jena), and S\u00E9bastien Leblond (Paris) for making facilities available during his visits to the herbaria of Geneva, G\u00F6ttingen, Jena, and Paris, and to Meise Botanic Garden and Friedrich-Schiller Universit\u00E4t Jena for financial support.
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