3. Grimmia decipiens (Schultz) Lindb. in Hartm. 北方紫萼藓 bei-fang zi-e xian
Handb. Skand. Fl. (ed. 8), 386. 1861. Dryptodon decipiens (Schultz.) Loesk., Stud. Morph. Syst. Laubm. 111. 1910. Trichostomum decipiens Schultz, Prodr. Fl. Starg. Suppl. 70. 1819. Type. Germany: “ad saxa granitosa rarius. -ad pagum Gevezien an der Landstrafse. Junio c. operculo.”
Plants robust, up to 3 cm high, yellowish green to green above, dark brown to black below, in dense or loose, hoary tufts. Stems moderately branched, with more or less well developed central strand in cross section. Leaves imbricate, erect when dry, erect-spreading when moist, 3.1–3.6 mm long, lanceolate to broadly lanceolate, keeled above, ending in a long, hyaline hair-point; hair-points 0.7–1.3 mm long, decurrent at margin of apex, strongly denticulate; margins recurved on one or both sides; costa strong, percurrent, in transverse section with small abaxial cells in basal part of leaf; upper cells bistratose in places, irregularly short-rectangular, 7–12 µm × 5–7 µm, with thick and sinuose walls; median cells rectangular, 9–18 µm × 5–7 µm, strongly sinuose; basal marginal cells short, rectangular to short-rectangular, 14–23 µm × 9–11 µm, with transverse walls thicker than longitudinal ones; basal juxtacostal cells narrowly rectangular, 23–46 µm × 7–9 µm, with sinuose walls. Autoicous. Perigonia often located just below the perichaetia. Setae long, arcuate, twisted when dry; capsules pendent, elliptic, 8-ribbed; exothecial cells variable in shape, mostly rectangular-hexagonal, thin-walled; stomata present at base of urn; annuli consisting of well developed elongate cells with thick walls; opercula with long, straight or slightly oblique beaks; peristome teeth single, erect, lanceolate, yellowish brown, imperfectly cleft in 2–3 branches and perforate to the middle, outer surface densely papillose above, sparsely papillose or nearly smooth below; inner surface papillose throughout. Calyptrae mitrate. Spores 12–16 µm in diameter, yellowish brown, granulose.