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Published In: Muscologia Recentiorum Supplementum 4: 78. 1819[1818]. (Muscol. Recent. Suppl.) Name publication detail
 

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

Illustration & Map     (Last Modified On 3/16/2009)
Related Objects:
Illustrations: X.-J. Li (ed.) 2000 (Pl. 19, figs. 11–19).


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Map: Racomitrium canescens (Hedw.) Brid. (Distribution in China)

Distribution     (Last Modified On 3/16/2009)
Distribution:
Habitat: on rocks or sandy soil in high mountains.
Distribution: China, Japan, Europe, and North America.
 

Specimens Examined     (Last Modified On 3/16/2009)
Specimens Examined:
Chinese specimens examined: Anhui: Mt. Huangshan, P.-C. Chen et al. 6542 (MO, PE). Heilongjiang: Ta-he Co., C. Gao 13131 (IFSBH). Henan: Xin-yang Co., J.-X. Luo 90 (MO, PE). Hubei: Mt. Shennongjia, 1980 Sino-Amer. Exped. 839 (MO). Jiangsu: Wu Co., P.-C. Wu & Y.-X. Jin 1737 (MO). Jilin: Mt. Changbai, C. Gao 22539 (IFSBH), Koponen 36642 (H, IFSBH). Nei Mongol: Da Xing An Ling (Greater Khingan Mt.), C. Gao 3395 (IFSBH). Shaanxi: Mt. Taibai, Z.-P. Wei 62609 (IFSBH). Taiwan: Tai-chung Co., Shevock 18034 (CAS, MO). Zhejiang: Mt. West Tianmu, R.-L. Hu 73 (MO).
 

Notes     (Last Modified On 3/16/2009)
general taxon notes:
Racomitrium canescens is characterized by a combination of such characters as the costa ca. 2/3–3/4 the leaf length and often forked near the tip, the hyaline hair-points dentate and papillose, and the leaf cells coarsely papillose. Racomitrium canescens is not as common in China as one might expect. There are number of misidentified specimens that are actually Racomitrium japonicum Dozy & Molk.

 

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6. Racomitrium canescens (Hedw.) Brid.   砂藓   sha xian
Muscol. Recent. Suppl. 4: 78. 1819[1818]. Grimmia ericoides (Hedw.) Brid. var. canescens (Hedw.) Lindb., Musci Scand. 29. 1879. Grimmia canescens (Hedw.) C. Müll., Syn. Musc. Frond. 1: 807. 1849, hom. illeg. Trichostomum canescens Hedw., Sp. Musc. Frond. 111. 1801. Type. Europe.
 
Plants robust, up to 7–8 cm long, green or yellowish green above, brownish below, in dense or loose tufts. Stems ascending, sparsely and irregularly branched; central strand absent. Leaves imbricately appressed when dry, erect-spreading when moist, suddenly narrowed from a broadly ovate base to a shortly lanceolate apex, 2.2–2.4 mm × 0.8–1.0 mm, keeled above, with papillose, dentate, relatively long hyaline hair-points; margins recurved on both sides; costa relatively short, ca. 2/3–3/4 the leaf length, often forked at tips; upper and median leaf cells rounded-quadrate to short-rectangular, 7–11 µm × 7–9 µm, sinuosely thick-walled, coarsely papillose, unistratose at margins; basal cells rectangular to elongate-rectangular, 18–46 µm × 5–9 µm, densely papillose, strongly sinuosely thick-walled; alar cells distinctly differentiated, consisting of 10–15 inflated, quadrate to short-rectangular cells, 10–29 µm × 9–23 µm, thin-walled. Perichaetial leaves smaller than stem leaves. Setae dark brownish, erect, ca. 15 mm long; capsules oblong-ovoid to cylindrical, erect, reddish brown, ca. 1.5–2.0 mm long; peristome teeth linear, reddish brown, divided to the base, densely papillose. Spores not seen.
 
 
 
 
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