8. Grimmia fuscolutea Hook. 尖顶紫萼藓 jian-ding zi-e xian
Musci Exot. 1: 63. 1818. Type. Mexico: In frigidis Tobeccae et Islahuacae, Humboldt & Bonpland 2673 (lectotype BM, designated by Muñoz 2000b, not seen).
Dryptodon apiculatus (Hornsch.) Hartm., Handb. Skand, Fl. (ed. 3), 270. 1838. Grimmia pulvinata var. apiculata (Hornsch.) Hueb., Muscol. Germ. 710, 1833, nom. inval. orthogr. err. Grimmia apiculata Hornsch., Flora 2(2): 442. 1819, nom. illeg., incl. typ. spec. prior. Grimmia affinis Hornsch., Flora 2(1): 85. 1819. Grimmia apiculata Hornsch., Flora 1(19): 329. 1818, nom. nud. Type. Austria: Windischmattreyer Tauern, Hornschuch s.n. (lectotype B, designated by Deguchi 1978).
Grimmia micropyxis Broth., Akad. Wiss. Wien Sitzungsber., Math.-Naturwiss. Kl., Abt. 1, 133: 567. 1924. Type. China: Sichuan (Setschwan), Yuan-yan (Yenyuen) Co., 28°15′N, ca. 4150–4300 m, Handel-Mazzetti 2671 (lectotype not seen, designated by Muñoz 2000b; isolectotype S).
Plants up to 1.5 cm high, yellow to yellowish green above, brown to dark brown below, in dense cushions. Stems moderately branched, with well developed central strand in cross section. Leaves imbricate, somewhat contorted when dry, spreading when moist, 1.6–2.2 mm long, lanceolate from an ovate base, gradually narrowed upward, keeled above, ending in more or less long, nearly smooth hyaline hair-points; margins revolute on one side or both sides in widest part of leaf; costa percurrrent, with several small median cells in cross section; upper cells unistratose except bistratose at margins, variable in shape and thickness of cell walls, irregularly quadrate to rectangular, 5–23 µm × 4–8 µm (length:width = 1–4:1), with strongly sinuose, thick walls; basal marginal cells elongate, with straight, thin walls, 23–46 µm × 7–9 µm (length:width = 3–5:1), sometimes forming a differentiated hyaline alar region; basal juxtacostal cells elongate, with straight walls. Autoicous. Perichaetial leaves larger than upper stem leaves, with elongate, hyaline hair-points; perigonia located just below perichaetia. Setae arcuate, twisted when dry; capsules emergent, ovoid-globose to oblong-ovoid, 1.0–1.2 mm long, smooth or ribbed when dry; exothecial cells elongate-hexagonal; stomata numerous, present near base of urn; annuli consisting of well developed, elongate cells, rather thick-walled; opercula with obtuse beaks; peristome teeth erect, lanceolate, reddish brown above, yellowish below, perforate above, both outer and inner surface coarsely papillose throughout. Calyptrae mitrate. Spores 11–13 µm in diameter, yellowish, granulose in regular rows.