Calypogeia decurrens (Steph.) Steph., Bull. Herb. Boissier ( ser . 2) 8 (9): 675 (407). 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 decurrens (Steph.) Steph., Bull. Herb. Boissier ( ser. 2) 8 (9): 675 (407). 1908. Figure 9K

Basionym.

Kantius decurrens Steph., Hedwigia 34 (2): 52. 1895.

Type. Indonesia, Sumatra, Kehding (isotype: G [G00060745!]).

Remarks.

The species status is seriously doubted by Söderström et al. (2016), probably due to supposed close morphological relations to C. arguta . However, the taxon is different from C. arguta in narrow (not U-shaped, as common in C. arguta ) leaf sinus and smooth cuticle (versus distinctly papillose) and especially in brown pigmentation of herbarium plants ( C. arguta is pale even in the very old type in STR). To attract some attention to this very poorly known species (and to stimulate the search for similar forms in the Meta-Himalaya), we include this Indonesian taxon in the key.

Figures

Figure 9. Calypogeia asakawana S. Hatt. ex Inoue: A plant habit, fragment, ventral view B, C underleaves D Leaf Calypogeia ceylanica S. Hatt. et Mizut.: E, F leaves H underleaf J leaf middle cells Calypogeia cuspidata (Steph.) Steph. G plant habit, fragment, ventral view I underleaf L leaf M leaf middle cells Calypogeia decurrens (Steph.) Steph.: K plant habit, fragment, ventral view. Scale bars: 2 mm (G); 1 mm (E, F, K); 500 µm (A, D, L); 200 µm (H, I); 100 µm (B, C); 50 µm (J, M). A from Holotype TNS- 174359; B, C, D from authentic material of C. okamurana Steph. nom. herb., G 00067726; E, F, H, J Isotype G 00064248, G, I, L, M from Lectotype G 00069713; K from Isotype G 00060745.