The Macaronesian liverwort Riccia boumanii Dirkse, Losada & M.Stech (Marchantiophyta: Ricciaceae) confirmed new to Asia by morphological and molecular evidence
CRYPTOGAMIE BRYOLOGIE(2022)
摘要
Riccia L. is the largest genus of complex thalloid liverworts with over 250 species currently accepted. Riccia boumanii Dirkse, Losada & M.Stech (Ricciaceae) has been considered to be endemic to the Canary Islands, Spain. Morphological evidence and molecular-phylogenetic analyses based on sequences of nuclear ribosomal ITS2, plastid rbcL, and plastid trnL-F confirm that this species occurs in Gansu and Sichuan, China. Riccia boumanii represents the first species of section Pilifer Volk of the genus in Asia. The low values of p-distances (0% for trnL-F-region, and 1.6% for ITS2-region) reveal that R. boumanii bears a low level of divergence. Micrographs, a distribution map and descriptions based on the Chinese plants are provided. The range extension of Riccia boumanii suggests that more taxa of Riccia may have a wider distribution.
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关键词
China,disjunct distribution,Eurasian distribution,liverworts,Marchantiales,p-distances
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