Calypogeia angusta Steph., Bull. Herb. Boissier ( ser . 2) 8 (9): 663 (395). 1908.

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

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Calypogeia angusta Steph., Bull. Herb. Boissier ( ser . 2) 8 (9): 663 (395). 1908.


Calypogeia angusta Steph., Bull. Herb. Boissier ( ser. 2) 8 (9): 663 (395). 1908.   Figures 2B, C View Figure 2 , 3A-G View Figure 3


Japan. Ozoresan: 11 October 1902, U. Faurie, 1181 (Lectotype (designated here): G [G00067716!]).


The species was described in Japan ( Stephani 1908) and was recently recorded in Chinese Guizhou ( Bakalin et al. 2015). We may suggest that some reports of Calypogeia muelleriana   from China may likely belong to this taxon due to rounded leaf lobes; if the underleaves are not considered, they are much more deeply divided and commonly bisbifid. The description based on the lectotype is as follows: plants more or less rigid, barely translucent, slightly glistening, yellowish brownish in the herbarium, well-developed plants 900-1700 µm wide; stem 200-300 µm wide, sparsely ventrally branched; rhizoids in obliquely spreading, brownish fascicles; leaves contiguous to subimbricate (overlapping 2/5 of adjacent leaf), obliquely inserted and oriented, convex, with apices turned to the ventral side, obliquely ovate, apex rounded, entire to somewhat crispate, 500-750 × 500-800 µm; underleaves 1.1-1.4 as wide as stem, decurrent for ¼ of stem width or less, bisbifid or with one additional lateral tooth on each side, sinus V-shaped, undivided portion 1-2 cell high; midleaf cells 25-55 × 25-37 µm, thin walled with small to moderate size, concave trigones, cuticle smooth.