Tropicos | Name - !Grimmia atrata Miel. ex Hornsch.

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!Grimmia atrata Miel. ex Hornsch.

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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:

Grimmia atrata Miel. ex Hornsch. (Figs. 8–17.)

Map:

Distribution (Last Modified On 5/4/2009)

Distribution:

Habitat: on exposed rocks and boulders in mountain areas; alt.1200–2000 m.

Distribution: China, Japan, India, and Europe.

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

Specimens Examined:

Chinese specimens examined: Jiangxi: Mt. Lushan, D.-K. Li 017391 (SHM). Shaanxi: Mt. Miaoyusan, Hugh 132(a) (as G. obtusifolia Dix. sp. nov., BM); Mt. Huashan C. Gao & T. Cao 16730 (IFSBH).

Notes (Last Modified On 5/4/2009)

general taxon notes:

Grimmia atrata is distinguished by the following characters: 1) leaves lingulate to lingulate-lanceolate, muticous, obtusely keeled, and somewhat twisted in the upper part when dry; 2) margins bistratose, recurved on one side in the basal part and plane on the other side; 3) basal marginal cells short, quadrate to short-rectangular; and 4) setae long and straight with exserted capsules. It is similar to G. handelii in having keeled, muticous leaves, but differs from the latter by the leaf shape and cells. Grimmia handelii has narrowly ovate-lanceolate leaves, unistratose upper leaf cells, and rectangular basal cells whose walls are thin and straight. In contrast, Grimmia atrata has lingulate to lingulate-lanceolate leaves, bistratose upper leaf cells, shorter basal maraginal leaf cells, and sinuose basal juxtacostal cells.

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2. Grimmia atrata Mielich. ex Hornsch. 黑色紫萼藓 hei-se zi-e xian

Flora 2: 85. 1819. Dryptodon atratus (Meilich. ex Hornsch.) Hartm., Handb. Skand. Fl. (ed. 3), 271. 1838. Type. Austria: “In Salzburg, an Felsen bei der Grube Schwarzwand in der Grosarl. Iul.” (lectotype B, designated by Deguchi 1978).

Plants up to 2.5 cm high, in dense or loose tufts, dark green to yellowish green above, blackish below. Stems erect, simple or sparsely branched, with poorly developed central strand in transverse section. Leaves appressed and somewhat twisted in upper part when dry, erect-spreading when moist, obtusely keeled, lingulate to lingulate-lanceolate, from an ovate base gradually narrowed to obtuse, somewhat acuminate apex, muticous, 1.5–2.6 mm long; margins recurved on one side at basal part of leaf, plane on other side, bistratose throughout; costa strong, ending below the apex, with small median cells in transverse section; upper cells bistratose, irregularly quadrate, more or less sinuose, 5–6 µm wide; median cells quadrate to short-rectangular, 7–16 µm × 5–7 µm, with thick, sinuose walls; basal marginal cells quadrate to short-rectangular, 12–20 µm × 8–9 µm, with straight to slightly sinuose walls; basal juxtacostal cells elongate, 23–46 µm × 7–9 µm, strongly sinuose. Dioicous. Perichaetial leaves similar to vegetative leaves. Setae long, straight; capsules exserted, erect, elliptic to subcylindric, smooth; exothecial cells rectangular with thin walls; annuli well developed, consisting of elongate, thick-walled cells; opercula with obtuse, straight or slightly oblique beaks; peristome teeth single, lanceolate, erect, perforate above, outer surface coarsely papillose above, moderately papillose below, inner surface papillose throughout. Calyptrae mitriform. Spores yellowish green, 12–16 µm in diameter, granulose.