6. Grimmia elongata Kaulf. in Sturm 长枝紫萼藓 chang-zhi zi-e xian
Deutschl. Fl., Abt. II, Cryptog. 2(15): 14. 1816. Dryptodon elongatus (Kaulf.) Hartm., Handb. Skand. Fl. (ed. 3), 271. 1838. Type. Austria: “im August 1812 auf der seethaler Alpe in Steyermark in Steinritzen mit reifen Fruchten.”
Grimmia decalvata Card., Bull. Herb. Boissier, ser. 2, 8(5): 332. 1908. Synonymized by Deguchi 1978.
Plants up to ca. 2 cm high, yellowish brown to reddish brown above, reddish brown to brownish below, in dense cushions, often forming large patches. Stems moderately branched from innovations, with poorly developed central strand. Leaves appressed, somewhat twisted when dry, spreading when moist, 1.6–2.0 mm long, lanceolate from a narrowly ovate base, slightly falcate, keeled above, ending in rather short, hyaline hair-points or muticous; margins narrowly recurved on one side, plane on the other side; costa stout, percurrent, somewhat narrowed toward leaf base, with nearly uniform cells or with small abaxial cells below median part of leaf in cross section; upper cells unistratose, bistratose at margins, irregularly quadrate to short-rectangular, 7–9 µm wide, with incrassate walls; median cells elongate-rectangular, 8–16 µm × 7 µm, conspicuously sinuose; basal cells transparent to translucent, elongate to rectangular, 24–48 µm × 7–9 µm, with thin and straight walls near margins and along costa. Dioicous. Perichaetial leaves similar to vegetative leaves, but larger with broad bases. Setae pale yellowish, 1.5–1.8 mm long, twisted to left when dry, straight; capsules yellowish brown, erect, obovate to elliptic, 1.2–1.4 mm × 0.4–0.6 mm; exothecial cells variable in shape, rounded-quadrate to rectangular, with thin walls; stomata numerous, at base of urn; annuli consisting of 2–3 rows of differentiated rounded-hexagonal cells with thick walls; opercula conic, with obtuse beaks; peristome teeth single, erect, lanceolate, pale yellowish above, yellowish brown below, with somewhat obtuse tips, outer surface densely and coarsely papillose above, nearly smooth in lower 1/3; inner surface papillose throughout. Calyptrae mitrate or cucullate. Spores yellowish, 11–14 µm in diameter, finely granulose.