A review of Calypogeia (Marchantiophyta) in the eastern Sino-Himalaya and Meta-Himalaya based mostly on types Bakalin, Vadim A. Klimova, Ksenia G. Nguyen, Van Sinh PhytoKeys 2020 153 111 154 3E7FF876-3457-5F96-A97E-582818D932EF (L.) Raddi, Jungermanniogr. Etrusca: 33. 1818. Jungermanniopsida Calypogeiaceae Calypogeia CoL Plantae Calypogeia fissa Jungermanniales 0 111 Marchantiophyta species fissa  Basionym.   Mnium fissumL., Sp. Pl. 1: 1114. 1753. nom. conserv. Original material: Great Britain, Surrey, Dorking; not seen.  Remarks.   Calypogeia fissais one of the oldest names in  Calypogeia, and several taxa were split from the original  C. fissas.l. The species seems to be restricted to Europe. Within North America and the northwestern amphi-Pacific (Commanders, Kamchatka, Kurils, Sakhalin),  C. fissais substituted by  C. neogaea(R.M. Schust.) Bakalin. Stotler and Crandall-Stotler (2017: 591) noted that  C. fissa"likely does not occur in North America and specimens identified as such likely belong to  C. neogaea". In an older time,  C. fissawas recorded in Japan, although it was doubted as early as Hattori (1952)and then was never mentioned for the Japanese flora. The nearest morphological ally of  C. fissain temperate East Asia is  C. tosana. Nevertheless,  Calypogeia fissawas several times recorded even at a relatively recent time for the East Asian mainland: Singh and Nath (2007a)recorded it for the East Khasi Hills and West Khasi Hills as well as (presumably based on other literature records, unfortunately not cited in l.c.) for Sikkim and Darjeeling. Bapna and Kachroo (2000)described its wide distribution in India. Wang et al. (2011)mentioned it for Taiwan; Fang et al. (1998), for Jiangxi. The records of the species for Yunnan and Hunan are based on Nicholson et al. (1930). Presumably, the vast majority of records of  C. fissamay be based on misidentifications of  C. tosana(if so, the latter is much more widely distributed on the Asian mainland than would be obvious if only available publications were taken into account). We hypothesize that 'true'  Calypogeia fissashould be restricted to Europe from where the only accessions were confirmed by Buczkowska et al. (2018), and that the species should be excluded from the Sino-Himalayan  Calypogeiaflora. Moreover, even in Europe,  Calypogeia fissais represented by two genetically well-separated taxa ( Buczkowska et al. 2011) that probably require taxonomic revision.