A review of Calypogeia (Marchantiophyta) in the eastern Sino-Himalaya and Meta-Himalaya based mostly on types Author Bakalin, Vadim A. Botanical Garden-Institute, Vladivostok, Russia https://orcid.org/0000-0001-7897-4305 vabakalin@gmail.com Author Klimova, Ksenia G. Botanical Garden-Institute, Vladivostok, Russia https://orcid.org/0000-0002-3229-1880 Author Nguyen, Van Sinh Institute of Ecology and Biological Resources, Graduate University of Science and Technology, Vietnam Academy of Science and Technology, Ha Noi, Vietnam text PhytoKeys 2020 153 111 154 http://dx.doi.org/10.3897/phytokeys.153.52920 journal article http://dx.doi.org/10.3897/phytokeys.153.52920 1314-2003-153-111 475172DBEA915C52B9909334D3DB5478 Calypogeia khasiana Ajit P. Singh et V. Nath, Taiwania 52 (4): 320. 2007. Type. India. Meghalaya: East Khasi Hills, Langkyrdum-Dawki Road, 07 Nov 1998, V. Nath et al. (holotype: LWG [206109-A]; not seen). Remarks. Singh and Nath (2007b) described Calypogeia khasiana from Khasia Mt. The species is somewhat similar to C. ceylanica , which differs in smaller cells and acute (not incised) leaf apex. The differences from C. lunata are less clear. Singh and Nath (2007b : 322) noted " C. lunata Mitt. differs from C. khasiana in having yellow brown color, stem 9-10 cells across and 0.25-0.26 x 0.36-0.38 mm in diameter, leaves obliquely ovate, apex narrowed, obtuse to subacute, bidentate, sinus less broad, acute to obtuse, lobes 2 cells long, underleaves bisbifid, lobes divergent, shallowly and irregularly notched, forming acute-obtuse dentitions". This list of features is untenable, for instance, because C. lunata is not yellowish in the herbarium and has similar (and greatly variable) leaf apex, and the same should be noted about underleaf shape. In our opinion, C. khasiana may be only a C. lunata habitat modification. The possible difference is in underleaves that are not or barely decurrent in C. khasiana (the feature is observed in the picture in the original paper, but no information on this feature is provided in the description), whereas commonly 1/2-1 of stem width decurrent in C. lunata . We include it in the key with some doubts, at the same couplets with C. lunata .