1. Hypnum calcicola Ando 钙生灰藓 gai-sheng hui xian
J. Sci. Hiroshima Univ., Ser. B, Div. 2, Bot. 8: 167. 1958. Type: Japan.
Plants medium-sized, pale green, in dense patches. Stems erect or ascending, up to 4 cm long, regularly or irregularly branched, branches remote, nearly flattened, 3–8 mm long; in stem cross section central strand slightly developed; pseudoparaphyllia shortly lanceolate. Stem leaves strongly falcate-secund, ovate- or triangular-lanceolate, concave, 2.2–2.7 mm × 0.60–0.75 mm, slenderly acuminate; margins plane, subentire or serrulate above the middle; costae double, relatively strong; median and upper leaf cells linear, 40–60 µm × ca. 3 µm, thick-walled; basal cells shorter, brownish; alar cells inflated, hyaline, with a few rows of subquadrate cells at margins; branch leaves smaller, oblong-lanceolate, 1.8–2.3 mm × 0.4–0.5 mm. Autoicous. Perichaetial leaves erect, elongate, up to 8 mm long, lanceolate, plicate, serrulate. Setae 1.5–2.5 cm long, smooth, reddish brown, twisted when dry; capsules inclined to horizontal, ellipsoidal, slightly curved, 1.2–1.8 mm long, more or less constricted below the mouth when dry; peristome teeth normal, with 2–3 cilia. Spores 15–22 µm in diameter.