Fissidens crenulatus Mitten 1859

This species is characterized by having the upper leaves acute, oblong-lanceolate to lanceolate, the costa shortly excurrent, the limbidia usually on the entire length of the vaginant laminae, the laminal cells with one or two papillae, and the capsules cylindrical to ovoid, erect, and symmetrical.

Plants small, green. Leafy stems simple, rarely branched, 1.8–2.5 mm long, 1.2–1.8 mm wide; axillary hyaline nodules not differentiated; central strand not differentiated. Leaves in 6–9 pairs, more or less uniform in size except the lowest ones; middle to upper leaves lanceolate, 0.6–1.2 mm × 0.2–0.3 mm, acute at apex; base of dorsal laminae rounded to wedge-shaped; vaginant laminae 1/2 –3/5 the leaf length, equal to slightly unequal; costa rather stout, excurrent or occasionally percurrent; margins distinctly serrulate; cells of apical and dorsal laminae quadrate to rounded-hexagonal to elliptic-rectangular, 3.5–9.0 µm long, highly mammillose or with one indistinct papilla, moderately thick-walled; limbidia often found on lower one-half of vaginant laminae of middle to upper and perichaetial leaves, composed of 1–4 rows of cells, 1 cell thick, moderately thick-walled. Autoicous. Male inflorescences bud-like, in leaf axils. Female inflorescences terminal on stems, rarely axillary or terminal on short lateral branches. Perichaetial leaves slightly longer and narrower than stem leaves, but those on lateral inflorescences much smaller. Archegonia about 210 µm long. Setae 1.5–2.3 mm long, slightly scabrous; capsules cylindrical, erect, symmetrical; urns 0.3 mm long; exothecial cells quadrate to short-rectangular, thin-walled; opercula rostrate, 0.2–0.3 mm long; peristome teeth 0.1–0.2 mm long, 28–32 µm wide at base. Spores 11–16 µm in diameter.

Distribution: China, Japan, Nepal, India, Myanmar, Vietnam, Malaysia, Micronesia, the Philippines, and New Guinea.

Habitat: mostly on rocks, rarely on soil.

Fissidens axilifolius Thwait. & Mitt., J. Linn. Soc., Bot. 13: 325. 1873, syn. nov. Type. Sri Lanka (Ceylon): Thwaites s.n. (isotype S-PA). Fissidens elmeri Broth., Leafl. Philipp. Bot. 2: 652. 1909, syn. nov. Fissidens crenulatus var. elmeri (Broth.) Iwats. & Suzuki, J. Hattori Bot. Lab. 51: 386. 1982. Type. The Philippines: Negros Prov., A. D. E. Elmer 10320 (holotype H-BR). Fissidens hueckii P. de la Varde, Rev. Bryol. Lichénol. 15: 145. 1946. Type. Southern China: Missionsgarten von Tongtowka/Tungkun, Dr. Hueck s.n. comm. T. Herzog (isotype JE). Fissidens sinensis (Rabenh.) Broth., Nat. Pflanzenfam. 1(3): 356. 1901. Conomitrium sinense Rabenh., Bryol. Eur. 25: no. 1202. 1873. Type. Vietnam: “Bei Saigon in China,” 1871/72 R. Rabenhorst s.n. (isotype H). Fissidens virens Thwait. & Mitt., J. Linn. Soc., Bot. 13: 324. 1873, syn. nov. Type. Sri Lanka (Ceylon): Thwaites s.n. (isotypes S-PA, W).

Fissidens crenulatus là một loài Rêu trong họ Fissidentaceae. Loài này được Mitt. mô tả khoa học đầu tiên năm 1859.

齒葉鳳尾蘚（学名：Fissidens crenulatus）为鳳尾蘚科鳳尾蘚屬下的一个种。