Tropicos | Name - !Grimmia macrotheca Mitt.

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!Grimmia macrotheca Mitt.

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Project Name Data (Last Modified On 3/16/2009)

Acceptance : Accepted

Project Data (Last Modified On 5/4/2009)

General Reference:

Gao, C., M. R. Crosby & S. He. 2003. Grimmiaceae–Tetraphidaceae. 3: viii+141. In Moss Fl. China. Science Press & Missouri Botanical Garden, Beijing, New York & St. Louis.

Illustration & Map (Last Modified On 5/4/2009)

Illustrations:

Map:

Distribution (Last Modified On 5/4/2009)

Distribution:

Habitat: on rocks; alt. ca. 2900 m.

Distribution: China and Sikkim.

Specimens Examined (Last Modified On 5/4/2009)

Specimens Examined:

Chinese specimens examined: Sichuan: Ba-tang Co., S. He 31583 (MO, PE); Dao-cheng Co., S. He 31817, 31859 (MO, PE); Xiang-cheng Co., S. He 31793a, 31800 (MO, PE); Ya-jiang Co., S. He 31991 (MO, PE).

Notes (Last Modified On 5/4/2009)

general taxon notes:

Grimmia macrotheca is characterized by the following features: 1) setae up to 5–7 mm long, twisted and seemingly erect when dry, but clearly curved above when moist; 2) capsules subcylindrical to cylindrical, up to 2.0–2.5 mm long with the length:width ratio =3–4:1; 3) peristome teeth linear-lanceolate, not cleft above; 4) leaves strongly keeled, with revolute margins on one or both sides; and 5) basal leaf cells nearly uniform, with thin, straight walls (sometimes the basal juxtacostal cells are slightly sinuose). Grimmia macrotheca is somewhat similar to G. longirostris, when the latter has rather long setae and capsules, but differs from G. longirostris in having thin-walled basal leaf cells, curved setae, horizontal capsules, and long, linear-lanceolate and entire peristome teeth.

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13. Grimmia macrotheca Mitt. 长蒴紫萼藓 chang-shuo zi-e xian

J. Proc. Linn. Soc., Bot., Suppl. 1: 44. 1859. Type. India [Sikkim]: J. D. Hooker 316 (holotype NY; isotype S).

Grimmia longicapusula C. Gao & T. Cao, Acta Bot. Yunnan. 3(4): 395. 1981. Type. China: Xizang (Tibet), Ya-dong Co., M. Zang 39 (holotype IFSBH; isotypes HKAS, NY).

Plants medium-sized, up to 1.5–2.0 cm high, yellowish green above, brown to dark brown below, in loose tufts. Stems moderately branched, with well developed central strand in cross section. Leaves imbricate, somewhat contorted or flexuose when dry, spreading when moist, 2.3–2.8 mm long, lanceolate from ovate base, strongly keeled above, ending in a short, smooth, hyaline hair-point; margins revolute on one or both sides; costa percurrent, consisting of small, median cells in cross section; upper cells unistratose except bistratose at margins, irregularly rounded-quadrate, 7–9 µm wide, with incrassate, slightly sinuose walls; median cells quadrate to short-rectangular, 9–14 µm × 9–10 µm, with thick, sinuose walls; basal marginal cells rectangular to elongate, 23–60 µm × 9–11 µm, with rather thin, straight walls; basal juxtacostal cells elongate, 28–60 µm × 7–9 µm, with thin, straight or slightly sinuose walls. Autoicous. Perichaetial leaves similar to upper stem leaves. Setae up to 5–7 mm long, twisted to almost erect when dry, flexuose or curved in upper part when moist; capsules erect when dry, horizontal or nearly so when moist, yellowish brown, subcylindrical to cylindrical, 2.0–2.5 mm × 0.7–0.8 mm (length:width = 3–4:1); exothecial cells elongate-hexagonal, thin-walled; stomata numerous, present near base of urn; annuli consisting of well developed elongate cells with thick walls; opercula conic-rostrate with obtuse beaks; peristome teeth reddish brown, erect, linear-lanceolate, ca. 0.25 mm long, not cleft and rarely perforate; outer and inner surface finely papillose throughout, more densely papillose above. Calyptrae not seen. Spores ca. l0 µm in diameter, yellowish, smooth.