10. Grimmia incurva Schwaegr. 卷叶紫萼藓 juan-ye zi-e xian
Sp. Musc. Frond., Suppl. 1(1): 90. 1811. Grimmia contorta var. incurva (Schwaegr.) Molendo, Jahres-Ber. Naturhist. Vereins Passau 10: 119. 1875. Type. Austria: “In summis alpibus Carinthiae, Glockner, C. Ludwig.” (lectotype G, designated by Deguchi 1978).
Plants up to 2 cm high, green to dark green above, dark brown to black below, in loose tufts. Stems moderately branched, with poorly developed central strand in cross section. Leaves appressed, more or less crisped or contorted when dry, spreading when moist, linear-lanceolate from elongate-rectangular base, upper part elongate-subulate, keeled above, 2.5–3.0 mm long, ending with smooth, hyaline hair-points; margins narrowly recurved on one side; costa percurrent, consisting of nearly homogeneous cells or somewhat small abaxial cells in cross section; upper cells unistratose except bistratose at margins, irregularly quadrate, sinuose, ca. 7 µm wide; median cells short-rectangular, 12–16 µm × 6–7 µm, with thick and strongly sinuose walls; basal marginal cells hyaline, elongate-rectangular to rectangular, 23–69 µm × 9–11 µm, with thin and straight walls; basal juxtacostal cells with more or less nodulose, thickened longitudinal walls. Dioicous or autoicous. Perichaetial leaves similar to vegetative leaves, but larger, with long hyaline hair-points. Setae more or less curved, twisted when dry, yellowish, ca. 2 mm long; capsules yellowish brown, cylindrical, ca. 2 mm long; exothecial cells elongate-hexagonal to rectangular, thin-walled; stomata present at base of urn; annuli consisting of quadrate cells with thick walls; opercula with obtuse beaks; peristome teeth lanceolate, outer surface densely papillose above, sparsely papillose below, inner surface papillose throughout. Calyptrae mitrate. Spores not seen.