6. Hypnum faurieiCard. 东亚灰藓 dong ya hui xian
Beih. Bot. Centralbl. 17: 41. f. 26. 1904. Type: Korea. Ouen-San, Kang-Quen-To, Faurie 35.
Plants medium-sized, yellowish green or brownish green. Stems prostrate, up to 5–10 cm long, radiculose; in stem cross section epidermal cells not inflated, with 3–4 layers of thick-walled, yellowish brown outer cortical cells, medullar cells large, hyaline, thin-walled, central strand slightly developed; pinnately or irregularly pinnately branched, densely branched, flattened, branches 3–7 mm long; pseudoparaphyllia lanceolate. Stem leaves falcate-secund, oblong-triangular to oblong-lanceolate, 1.5–2.7 mm × 0.45–0.75 mm, slenderly acuminate, not plicate; margins sometimes recurved below, serrulate above; costa double, extending up to 1/3 the leaf length; median leaf cells linear, 60–70 µm × 3–5 µm; basal cells usually golden yellow; alar cells inflated, hyaline, distinctly forming an excavate group, colored with reddish brown; branch leaves elliptical-lanceolate, slenderly acuminate, smaller than stem leaves, 1.2–1.8 mm × 0.25–0.45 mm; margins serrulate in the upper 2/3 of the leaf length; alar cells not clearly differentiated. Autoicous. Perichaetial leaves lanceolate, slenderly acuminate, clearly plicate, serrulate above, hyaline or somewhat brownish yellow at base. Setae 2.5–4.0 cm long, yellowish brown to reddish brown, twisted when dry; capsules yellowish brown to dark brown, horizontal, cylindrical, 2.3–3.0 mm long, constricted below the mouth when dry; opercula conic, blunt apiculate; annuli consisting of 2 rows of cells; peristome typically hypnoid, with 2–3 cilia. Calyptrae not seen. Spores 15–23 µm in diameter, minutely papillose.