1. Coscinodon cribrosus (Hedw.) Spruce 小孔筛齿藓 xiao-kong shai-chi xian
Ann. Mag. Nat. Hist. ser. 2, 3: 491. 1849. Grimmia cribrosa Hedw., Sp. Musc. Frond. 76. 1801. Type. “In petris Goslariae, nec non Hassiae montis Meisner elegeutem speciem primi detexerunt Persoon et Schrader” (holotype G).
Grimmia sinensi-anodon C. Müll., Nuovo Giorn. Bot. Ital., n. ser., 5: 188. 1898. Type. China: Shaanxi (Schen-si) Prov., in loco dicto Zu-lu (Sao-y-san), J. Giraldi 2063 (lectotype H, designated by T. Cao & Vitt 1986). Synonymized by Muñoz 1998b; with Grimmia caespiticia (Brid.) Jur. by T. Cao & Vitt 1986.
Plants small, ca. 5(–10) mm high, dark green to blackish green, in densely caespitose mats. Stems erect, simple, sometimes remotely branched. Leaves erect-imbricate when dry, crowded and enlarged toward apex, erect-spreading when moist, narrowly ovate-lanceolate, 1.0–2.0(–3.0) mm × 0.4–0.6 mm, keeled above, somewhat concave below, acuminate and ending with a long, hyaline hair-pointed leaf apex (usually longer than 0.5 mm), strongly plicate on both sides of costa; leaf margins entire, plane below, more or less incurved above shoulder; costa strong, single, percurrent, convex on the dorsal side, in cross section costal cells more or less uniform; upper and median leaf cells obscure, irregularly quadrate to rounded-quadrate, (8–)10–15 µm wide, thick-walled, smooth, in cross section bistratose in the upper part; basal marginal cells and juxtacostal cells short- to elongate-rectangular, 25–40(–50) µm × (8–)10–12 µm, thin-walled, smooth, marginal cells in 3–4 rows with transverse thickening walls. Sporophytes not seen.