40. Fissidens polypodioides Hedw. 网孔凤尾藓 wang-kong feng-wei xian
Sp. Musc. Frond. 154. 1801. Type. Jamaica, Swartz s.n.
Fissidens areolatus Griff., Calcutta J. Nat. Hist. 2: 506. 1842. Fissidens polypodioides var. areolatus (Griff.) Wils., Hooker’s J. Bot. & Kew Gard. Misc. 9: 294. 1857.
Plants large, green, yellowish green to brownish, in lax tufts. Leafy stems 27–72 mm long, 6.0–6.8 mm wide, simple or branched; central strand well developed. Axillary hyaline nodules not developed. Leaves in 23–58 pairs, densely arranged except the lowermost ones, which are much smaller and more or less loosely arranged; middle to upper leaves oblong-lanceolate, 3.6–4.1 mm × 1.0–1.1 mm, mostly mucronate, occasionally broadly acute; base of dorsal laminae rounded; vaginant laminae 1/2 the length of the leaf, equal or slightly unequal; costa stout, usually ending a few cells below leaf apex, rarely percurrent; coarsely serrulate near apex, slightly serrulate throughout the rest of margin; cells of apical and dorsal laminae quadrate to hexagonal, 11–21 µm long, smooth to slightly mammillose, well demarcated, moderately thick-walled; cells of vaginant laminae similar to those of apical and dorsal laminae, but larger, with thicker walls, especially towards the base near costa. Dioicous. Female inflorescences usually terminal on short lateral branches. Archegonia 340–596 µ m long. Perichaetial leaves differentiated, shorter and narrower than stem leaves, 4.6–5.6 mm long, 0.4–0.6 mm wide, acute, base of dorsal laminae wedge-shaped, cells of vaginant laminae much longer than those of apical and dorsal laminae.