FIGURE 2. Anthoceros angustus Steph. A. Thallus with marginal gemmae. B. Male thallus, with androecia linearly arranged along the median line. C. Gemma. D in A revision of the genus Anthoceros (Anthocerotaceae, Anthocerotophyta) in China

FIGURE 2. Anthoceros angustus Steph. A. Thallus with marginal gemmae. B. Male thallus, with androecia linearly arranged along the median line. C. Gemma. D. Dehisced antheridia with orange chromoplasts in jacket cells. E. Transverse section of thallus showing large mucilage cavities. F. Elongated epidermal cells of a young capsule, showing thin-walled cells and two stomata. G. Epidermis of thallus, showing solitary chloroplasts with starch granules. H. Elongated, thin-walled pseudoelater. I, K, N, O. SEM micrographs showing proximal spore faces with distinct trilete marks and shortly papillate to spinulate-blunt protuberances. J, L, M, P. SEM micrographs showing distal spore faces with adherent studded spines forming a false lamellate pattern. A and C–M from T. Peng & J. Wang 20110520-8 (HSNU), B and D from T. Peng & J. Wang 20111011-9 (HSNU), N–P from Rev. Bretaudeau 1239 (holotype of Anthoceros angustus: G-12816). Scale bars: A, B=1 mm; C, E=100 µm; D, F, H=50 µm; G, I–P=10 µm.