Calypogeia granulata Inoue, J. Jap. Bot. 43 (10/11): 468. 1968.

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 granulata Inoue, J. Jap. Bot. 43 (10/11): 468. 1968.


Calypogeia granulata Inoue, J. Jap. Bot. 43 (10/11): 468. 1968. Figures 4A-K View Figure 4 , 5A-E View Figure 5


Japan. Saitama Prefecture: Kuroyama, 500 m a.s.l., 24 June 1968 H. Inoue 18004 (holotype: TNS [174361!]; isotype: G [G00114896!]).

Calypogeia granulata was previously treated as a Japanese endemic taxon. Later, however, it was recorded (also confirmed by DNA testing) for northern Vietnam and Guizhou Province in China ( Buczkowska et al. 2018; Bakalin et al. 2018). Moreover, strong infraspecific genetic variation was observed within the taxon. It is worth mentioning that some Japanese populations are farther from the type that was also sequenced than the genetic distance between the type and the accessions from Guizhou and Vietnam (cf. Buczkowska et al. 2018). Two specimens named C. granulata from Japan ( Buczkowska et al. 2018) are so well distanced from the bulk of other so-named specimens that they may be regarded as discrete subspecies (if not separate species!). The variation in oil body color was additionally observed in the species. The taxon was described as having blue-grayish oil bodies, but oil bodies are totally gray to grayish in Guizhou material. Whether these colors represent the stage preceding morphological deterioration or a real morphological peculiarity of geographically distanced populations is currently unknown.

Morphologically, the taxon is similar to Calypogeia tosana (due to bisbifid underleaves and acute, sometimes incised leaves), from which it differs in underleaves decurrent for 2/3-3/3 of stem width and oil bodies indicated even in the original label as grayish blue "with numerous granules" (= finely granulate).

The description based on type specimens is as follows: plants green, strongly glistening, translucent, 1.5-2.1 mm wide, 1-3 cm long; stem greenish, soft, 220-320 µm wide, sparsely ventrally branched; rhizoids sparse to common, in unclear loose fascicles, obliquely spreading, grayish; leaves contiguous to subimbricate (overlap 1/3 of above situated leaf), very obliquely to subhorizontally inserted, slightly convex, apical third turned to ventral side, not or shortly decurrent, when flattened -- obliquely triangular-ovate, 900-1000 × 900-1000 µm, very shortly incised or apex apiculate; underleaves obliquely spreading, decurrent for 1/3-2/3 of leaf length, commonly bisbifid, divided by U-shaped sinus, undivided area 2-3 cell high, 250-300 × 550 µm, 1.1-1.6 as wide as stem; cells in the midleaf thin-walled, with vestigial trigones, 32.5-52.5 × 30.0-37.5 µm, cuticle smooth.