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 vietnamica Bakalin et Vilnet Herzogia 32 (1): 225. 2019. Type. Vietnam. Lao Cai Province: SaPa District, San Sa Ho Commune, Hoang Lien Range, Phan Xi Pang Peak area, Rhododendron -dominated forest with bamboo thickets and many rocky outcrops, moist cliffs in partial shade ( 22°18.45'N , 103°46.567'E ), 2900 m alt., 20 April 2017, V.A. Bakalin & K.G. Klimova V-9-23-17 (holotype: VBGI!). Remarks. This taxon was recently described in moist rocky outcrops at the highest elevation in Indochina - Phan Xi Pang Mt. - in the somewhat unique formation of a 'mossy' Rhododendron forest resembling mossy forests occurring in humid tropics, although different from the latter florogenetically (cf. Bakalin et al. 2019b ). The species is characterized by blue oil bodies and noticeably large underleaves (only slightly smaller than the leaves) divided by a U-shaped sinus descending to 2/5-1/2 of underleaf length. The species may be expected in other areas of mountainous Indochina, if not spread more widely to the eastern Sino-Himalaya. The description and illustrations were published very recently, and it seems that no more information should be added here.