Calypogeia khasiana Ajit P. Singh et V. Nath, Taiwania 52 (4): 320. 2007.

Bakalin, Vadim A., Klimova, Ksenia G. & Nguyen, Van Sinh, 2020, A review of Calypogeia (Marchantiophyta) in the eastern Sino-Himalaya and Meta-Himalaya based mostly on types, PhytoKeys 153, pp. 111-154 : 111

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 × 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 .