21. Fissidens grandifrons Brid. 大叶凤尾藓 da-ye feng-wei xian
Muscol. Recent. Suppl. 1: 170. 1806. Type. U.S.A.: “Nova Anglia.”
Fissidens diversiretis Broth., Symb. Sin. 4: 11. 1929. Type. China: Yunnan, between Ngaiwa and Mekong, 7 X 1915, Handel-Mazzetti 8477 (holotype H-BR).
Fissidens grandifrons var. planicaulis (Besch.) Nog., J. Hattori Bot. Lab. 7: 68. 1952. Fissidens planicaulis Besch., Ann. Sci. Nat. Bot., sér. 7, 17: 335. 1893.
Fissidens yunnanensis Besch., Rev. Bryol. 18: 88. 1891. Type. China: Yunnan, Delavay 4631 (isotype H-BR).
Plants medium-sized to large, creeping, dark green, rigid, brownish when old. Leafy stems simple or branched, 16–86 mm long, 2.5–3.0 mm wide; axillary hyaline nodules differentiated; cortical cells small, thick-walled; central strand not differentiated. Leaves in 13–83 pairs, densely arranged, stiff even when dry, the lowest leaves small, middle to upper leaves lanceolate to ensiform-lanceolate, 2.8–3.5 mm × 0.4–0.5 mm, obtuse to acute at apex; base of dorsal laminae wedge-shaped, decurrent; vaginant laminae about 1¤2 the leaf length, equal; costa stout, but obscure, ending a few cells below leaf apex; margins slightly serrulate; in cross section apical and dorsal laminae 1–2 cells thick at margin, 3–6 cells thick near costa, one cell thick for most parts of vaginant laminae; laminal cells near margin smaller, with thinner cell walls, larger, with thicker cell walls toward costa; cells of apical and dorsal laminae quadrate to hexagonal, 7–11 µm long, smooth, moderately thick-walled to thick-walled; cells of vaginant laminae similar to those of apical and dorsal laminae, but larger, with thicker walls toward base. Dioicous. Female inflorescences axillary. Archegonia 400–640 µm long, with stalks up to 140 µm long. Setae 18–21 µm long, smooth; capsules erect to horizontal, symmetrical; urns cylindric, 1.1–1.6 mm long; exothecial cells quadrate to shortly rectangular; peristome teeth ca. 0.43 mm long, 114 µm wide at base. Spores 14–25 µm in diameter.