Calypogeia marginella Mitt., J. Proc. Linn. Soc., Bot. 5 (18): 106. 1860 [1861].

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 marginella Mitt., J. Proc. Linn. Soc., Bot. 5 (18): 106. 1860 [1861].


Calypogeia marginella Mitt., J. Proc. Linn. Soc., Bot. 5 (18): 106. 1860 [1861]. Figures 4T-Z, AA-AC, 8A-D View Figure 4


India. Khasia 1849 Hooker, no. 1339 (syntype: JE [JE-04005904, =JE-H4084!]; syntype: G [G00113555/5289!]).


Calypogeia marginella is a distinct narrow endemic taxon with a range probably restricted to the Khasia Hills. The species was described by Mitten (1860) from the Khasia Mountains (Hills). Singh and Nath (2007a) recorded it for the West Khasi Hills and East Khasi Hills. However, it is worth noting that the treatment of the taxon in Singh and Nath (2007a) should be incorrect because authors do not show in the figures nor mention in the description exceedingly large cells along leaf margin that are distinctly characteristic of the taxon. Which species they discussed under C. marginella is not clear to us.

The description based on the syntype G00113555/5289 is as follows: plants brownish to greenish brownish, slightly translucent and glistening, 2.0-2.5 mm wide; stem 140-200 µm wide, sparsely ventrally branched; rhizoids virtually absent or solitary, obliquely spreading; leaves contiguous to overlapping 1/3-1/2 of the leaf base of the next leaf, nearly planar to slightly convex, subhorizontally inserted and oriented, shortly or up to 1/2 of stem width decurrent, widely obliquely ovate to rounded-lingulate, with rounded apex, 1100-1300 × 1000-1300 µm; underleaves appressed to the stem, decurrent for 1/2-2/3 of stem width, divided mostly by very narrow V-shaped sinus into two lobes without additional lateral teeth or shortly bisbifid, with rounded to obtuse lobes, undivided portion 3-6 cell high; midleaf cells 30-65 × 17-37 µm, thin-walled, trigones small, cuticle smooth; marginal cells considerable larger and elongate along leaf margin, 70-80 µm long, with thickened external wall.

Calypogeia marginella is a very distinct species due to the elongated cells along the leaf margin, wide leaves and transversely elliptic but not deeply divided underleaves.

Calypogeia nasuensis Inoue, Bull. Natl. Sci. Mus. Tokyo, n.s. 12: 653. 1969.

Figure 11E, G, H View Figure 11


Japan. Tochigi Prefecture: Nasu, 700 m a.s.l., August 1968, Empress Nagako (holotype: TNS: TNS-174632!]; isotype: G [G00064238!]).


The taxon is currently known from Japan only (Honshu). It was recently synonymized with C. asakawana ( Isono et al. 2006), which is similar in relatively small underleaves and leaves with commonly rounded apices. However, we think these taxa are different due to the finely asperulose leaf cuticle, sometimes bisbifid underleaves and leaf apex not only rounded but also truncate and even shortly bifid, which are characteristic of C. nasuensis and dissimilar to the smooth cuticle, bifid underleaves, rounded leaf apex and less than 1/3 of stem width decurrent underleaves of C. asakawana .

The description based on the holotype is as follows: plants merely soft, glistening and translucent, greenish, 1.2-1.6 mm wide; stem 150-200 µm wide, sparsely ventrally branched; rhizoids numerous, in short, divaricate, grayish, erect spreading fascicles; leaves obliquely inserted and oriented, slightly concave-canaliculate or slightly convex (then apex somewhat turned to ventral side), ventrally decurrent for 1/2 of stem width or farther, 750-900 × 750-800 µm, with rounded or truncate apex; underleaves obliquely spreading, 1.0-1.5 as wide as stem, decurrent for 1/3-1/2 of stem width, deeply divided by U-shaped sinus into two lobes, entire at margin or with blunt tooth on one or each lateral side or very shortly bisbifid cells in the midleaf thin-walled, trigones vestigial to nearly absent, 35-52 × 25-40 µm, cuticle finely but distinctly papillose.