FIGURE 4. Anthoceros punctatus L. A. Thalli with immature light green sporophytes. B in A revision of the genus Anthoceros (Anthocerotaceae, Anthocerotophyta) in China

FIGURE 4. Anthoceros punctatus L. A. Thalli with immature light green sporophytes. B. Dorsal lamellae on thallus. C. Transverse section of thallus showing large mucilage cavities. D. Nostoc colony within ventral thallus in transverse section. E. Transverse section of thallus showing one antheridial cavity with four antheridia (arrow). F. Transverse section of a young sporophyte with a central columella (C), single-layered sporogenous tissue (ST), four-layers of assimilative cells (AC) and non-photosynthetic epidermis (E). G. Dorsal thallus epidermis with a single chloroplast. H. Thin-walled epidermis of capsule with stomata. I. Three-celled pseudoelater, showing thin-walls and irregular thickenings. J. SEM micrograph showing proximal spore face with distinct trilete mark and reticulations (foveate-reticulate). K. SEM micrograph showing distal spore face which is spinulate and reticulate with bold spinulate ridges, spines subacute at apex with rounded heads, occasionally bifurcating. L. SEM micrograph showing spores and pseudoelaters. A–I from T. Peng 20110220-11 (HSNU), J–L from D.-K. Li & C.-H. Gao 07035 (SHM). Scale bars: A=2 mm; B=1 mm; C=100 µm; D=200 µm; E–H=50 µm; I, L=20 µm; J, K=10 µm.