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Published In: English Botany 18: 1259. 1804. (Engl. Bot.) Name publication detail

Project Name Data (Last Modified On 3/16/2009)
Acceptance : Accepted
Project Data     (Last Modified On 5/4/2009)
General Reference:

Illustration & Map     (Last Modified On 5/4/2009)
Illustrations: Grimmia donniana Sm. (Figs. 1–11.)
Map: Grimmia donniana Sm. (Distribution in China)

Distribution     (Last Modified On 5/4/2009)
Habitat: on exposed siliceous or granitic rocks at higher elevations.
Distribution: China, Japan, India, Russia, Europe, North Africa, North and South America.

Specimens Examined     (Last Modified On 5/4/2009)
Specimens Examined:
Chinese specimens examined: Xizang: Ding-ri Co., K.-Y. Lang 5302 (PE); Mi-lin Co., K.-Y. Lang 598 (PE); Ya-dong Co., M. Zang 669 (ALTA, HKAS).

Notes     (Last Modified On 5/4/2009)
general taxon notes:
Grimmia donniana is distinguished by having plane leaf margins and elongate-rectangular basal cells that are straight and thin-walled. The setae are straight when moist. The capsules are emergent. The annuli are just moderately developed with quadrate to short-rectangular, thick-walled cells.
Habeeb (1950) considered G. montana Bruch & Schimp. as a synonym of G. donniana. Our examination of the types of these two species shows that they are distinct. Grimmia donniana has elongate-rectangular, thin-walled basal marginal leaf cells and an autoicous sexual condition, while G. montana has quadrate to short-rectangular, transversely thick-walled basal marginal leaf cells and a dioicous sexual condition. Previous records of G. donniana from Mt. Changbai, Jilin province, by C. Gao (1977) and Koponen et al. (1983) are misidentifications, and the specimens represent Grimmia longirostris Hook. Grimmia donniana thus far has only been collected from Xizang.


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4. Grimmia donniana Sm.   卷边紫萼藓 juan-bian zi-e xian
Engl. Bot. 18: 1259. 1804. Dryptodon donnianus (Sm.) Hartm., Handb. Skand. Fl. (ed. 3), 270. 1838. Grimmia obtuse var. donniana (Sm.) Hartm., Handb. Skand. Fl. (ed. 5), 377. 1849. Type. United Kingdom: North Wales, July 1802, D. Turner s.n. (lectotype BM, designated by Muñoz 1998b).
Plants small, up to 1.0 cm high, dark green to blackish, in small, dense cushions. Stems sparsely branched, with well developed central strand in cross section. Leaves imbricate, slightly curved when dry, spreading when moist, 1.7–2.4 mm long, elongate-lanceolate to narrowly lanceolate from an ovate base, strongly keeled, ending with narrow, nearly smooth, 0.2–0.6 mm long, hyaline hair-points; the lower leaves small, muticous; margins plane throughout, bistratose above; costa single, percurrent, with small median cells in cross section; upper cells bistratose, rounded-quadrate, 7–9 µm wide, with slightly sinuose walls; median cells rectangular, 9–16 µm × 7–8 µm, sinuose; basal marginal cells rectangular, 35–70 µm × 9–11 µm, hyaline, rather thin-walled; basal juxtacostal cells elongate-rectangular, 35–70 µm × 7–8 µm, more or less transparent, with somewhat thickened, straight walls. Autoicous. Perichaetial leaves similar to the upper stem leaves; perigonia often on branches arising from older basal parts of stems. Setae yellowish brown, 1.6–1.8 mm long, twisted to left when dry, straight when moist; capsules emergent, erect, ovate to elliptic, smooth, yellowish brown, 1.0–1.2 mm long; exothecial cells rectangular to rounded-quadrate, thin-walled; stomata near base of urn; annuli consisting of quadrate to short-rectangular, thick-walled cells in 2–3 rows; opercula convex, with short, straight, blunt beaks; peristome teeth erect, lanceolate, yellowish brown, ca. 0.18–0.20 mm long, hardly split and perforate above, outer surface densely papillose in upper half, papillose in lower half, inner surface papillose throughout. Calyptrae small, mitrate. Spores 9–10 µm in diameter, finely granulose.


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