Bazzania sikkimensis (Steph.) Herzog

Pócs, Tamás, 2023, New records for the liverwort and hornwort flora of Vietnam 2. Bazzania Gray and some other collections of Pierre Tixier in the National Museum of Natural History, France, Cryptogamie, Bryologie 20 (9), pp. 197-210 : 202

* Bazzania sikkimensis (Steph.) Herzog

( Fig. 1E, F )

SPECIMEN EXAMINED. — “ Benom da Treu ” was the only locality indication on the envelope ( PC [ PC0464741 ]).

ILLUSTRATIONS. — Sharma & Srivastava 1993: 42-43; Zhou et al. 2012: 44.

NOTES

Benom da Treu is a mountain summit in southern Vietnam, approachhing 1800 m altitude, covered mostly by pine forests. It lies north of Da Lat town in Lâm Đồng province. Bazzania sikkimensis has small, contiguous, ovate triangular, bilobate side leaves with finely punctate cuticle. The underleaves distant, truncate orbicular with sinuously dentate apex, composed only of chlorophyllose cells. It differs from B. bidentula by its leaf and underleaf cells, which are only 18-25 µm in size, while in B. bidentunla they are 30 µm ( Schwarz et al. 2023). It differs from the related Bazzania mayebarae by its underleaves consisting of only chlorophyllose cells. In this fragmentary specimen the underleaves are not reflexed, as used to be mostly by this species. It has Sino-Himalayan distribution, known also from India, Nepal, Bhutan, southern China, Philippines and Thailand ( Sharma & Srivastava 1993; Zhou et al. 2012). New to Vietnam.

Figures

FIG. 1. — Bazzania adnexa (Lehm. & Lindenb.) Trevis.: A, underleaf; B, leaf distal half (Tixier 5256). Bazzania asymmetrica (Steph.) N.Kitag.: C, underleaf; D, habit, ventral view (Tixier s.n., PC0764741). Bazzania bidentula (Steph.) Steph. ex Yamada: E, habit, dorsal view; F, habit, ventral view (Tixier s.n., PC0764741). Scale bars: A, 125 µm; B, C, F, 250 µm; D, E, 500 µm.