Fissidens gymnogynus Bescherelle 1898

Plants small to medium-sized, yellowish green to light brownish. Leafy stems usually unbranched, sometimes with a few branches at the base, 7–16 mm long, 1.8–3.6 mm wide; axillary hyaline nodules lacking; central strand only slightly differentiated. Leaves in 9–25 pairs, rather densely arranged, distinctly crisped when dry; the lowermost leaves smaller, becoming larger toward to the middle; middle and upper leaves lingulate to lanceolate, 1.8–2.1 mm × 0.3–0.5 mm, mucronate to acute at apex; base of dorsal laminae rounded to wedge-shaped; vaginant laminae 1/2 –3/5 the leaf length, unequal; costa stout, usually ending a few cells below leaf apex; margins crenulate to slightly serrulate; cells at the apex rounded-rhombic, smooth and thick-walled, forming a lighter region; cells of apical and dorsal laminae hexagonal to rounded-hexagonal, 10–14 µm long, mammillose, obscure; cells of vaginant laminae hexagonal, with thicker and clearer walls. Phyllodioicous. Archegonia terminal, about 470 µm long. Perichaetial leaves not well differentiated. Setae ca. 2.3 mm long, reddish brown; capsules erect, symmetrical; urns cylindrical, ca. 1.1 mm long.

Distribution: China, Korea, and Japan.

Habitat: on tree trunks or on rocks, rarely on soil.

Fissidens gymnogynus là một loài Rêu trong họ Fissidentaceae. Loài này được Besch. mô tả khoa học đầu tiên năm 1898.

裸萼鳳尾蘚（学名：Fissidens gymnogynus）为鳳尾蘚科鳳尾蘚屬下的一个种。