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

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

Type.

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

Remarks.

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.

Figures

Figure 2. Calypogeia aeruginosa Mitt.: A plant habit, fragment, ventral view Calypogeia angusta Steph.: B leaf C underleaf Calypogeia apiculata (Steph.) Steph.: D plant habit, fragment, ventral view E leaf apex Calypogeia arguta Nees et Mont.: F plant habit, fragment, ventral view Calypogeia cordistipula (Steph.) Steph.: G underleaf H plant habit, fragment, ventral view I leaf J leaf margin cells K leaf middle cells. Scale bars: 1 mm (A, F); 500 µm (B, D, G); 200 µm (C, G); 50 µm (E, J, K); 2 (N); 2 mm (H). A from Isotype G 00064244 / 5286; B, C from Lectotype G 00067716; D, E Holotype G 00061103; F Holotype STR (n. 163); G-K from Lectotype G 00061105 / 10811.

Figure 3. Calypogeia angusta Steph.: A plant habit, fragment, ventral view B, C, D underleaves E, F, G leaves Calypogeia apiculata (Steph.) Steph.: H plant habit, fragment, ventral view I plant habit, fragment, ventral view Calypogeia arguta Nees et Mont.: J plant habit, fragment, ventral view Calypogeia cordistipula (Steph.) Steph.: K plant habit, fragment, dorsal view L plant habit, fragment, ventral view M, N leaves O, P underleaves. A-G from Lectotype G 00067716; H, I lectotype G 00061103; J holotype STR (n. 163); K-P from Lectotype G 00061105 / 10811.