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 ceylanica S. Hatt. et Mizut., Candollea 23: 288. 1968. Figures 6F-M , 9E-J Type. Sri Lanka. Central Province: Nuwara-Eliya, 1950 m a.s.l., 24-27 February 1954, F. Schmid 10334 (isotype: G [G00064248!]). Remarks. Calypogeia ceylanica is known as a taxon restricted to Ceylon (Sri Lanka) and was never recorded for the Sino-Himalaya, although it may be expected in Sikkim, Assam, or even farther. Moreover, some reports of C. muelleriana may actually be based on C. ceylanica . Calypogeia ceylanica differs from C. muelleriana in more deeply divided and narrower underleaves and apiculate to shortly bidentate leaf apices (a feature that very rarely occurs in C. muelleriana ). The description based on isotype plants is as follows: plants yellowish brownish in herbarium, glistening, translucent, 2.2-3.5 mm wide 3-5 cm long; stem 370-450 µm wide, branching not seen; rhizoids in loose colorless to brownish fascicles, sparse to numerous; leaves obliquely inserted, slightly concave or convex, somewhat turned to ventral side, not or barely decurrent ventrally, obliquely ovate, well developed 560-670 x 450-550 µm , apex acute to (rarely) unclearly and very shortly bidentate; underleaves obliquely spreading, 1.1-1.3 as wide as stem, decurrent for 1/4 -1/3 of stem width, divided by V- to U-shaped sinus into two lobes, lateral teeth absent or present and unclear, undivided portion 2-3 cells high; midleaf cells thin-walled, trigones very small to vestigial, 35-80 x 35-58 µm , cuticle smooth.