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Published In: Muscologia Recentiorum Supplementum 4: 80. 1819[1818]. (Muscol. Recent. Suppl.) 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: Racomitrium aciculare (Hedw.) Brid. (Figs. 1–10.)
Map: Racomitrium aciculare (Hedw.) Brid. (Distribution in China)

Distribution     (Last Modified On 5/4/2009)
Distribution:
Habitat: on sandy soil or surface of rocks in high mountains.
Distribution: China, Japan, Europe, and North America.
 

Specimens Examined     (Last Modified On 5/4/2009)
Specimens Examined:
Chinese specimens examined: Jilin: Mt. Changbai, Koponen 36630 (H, IFSBH). Zhejiang: Mt. Jiulong, R.-L. Hong & Z.-L. Liu 65 (HSNU, IFSBH).
 

Notes     (Last Modified On 5/4/2009)
general taxon notes:
Racomitrium aciculare is characterized by its oblong-ligulate leaves that are rounded-obtuse and without hair-points. The papillae of leaf cells are distinctly smaller than those of the other species in the genus. In comparison with European and North American specimens, the Chinese specimens have smaller plants, more broadly rounded-obtuse leaf apices, and much less developed leaf dentation.

 

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1. Racomitrium aciculare (Hedw.) Brid.   钝叶砂藓   dun-ye sha xian
Muscol. Recent. Suppl. 4: 80. 1819[1818]. Bryum aciculare (Hedw.) Jolycl., Syst. Sex. Vég. 750. 1803. Dicranum aciculare Hedw., Sp. Musc. Frond. 135. 1801. Type. Europe: Helvetia.
Racomitrium molle Card., Bull. Herb. Boissier, ser. 2, 8: 333. 1908.
 
Plants stiff, small, up to 2.0(–3.0) cm long, dark green or yellowish green above, brownish below, in loose tufts. Stems erect or ascending, simple or sparsely branched; central strand absent. Leaves appressed and imbricate when dry, erect-spreading when moist, oblong-ligulate, 1.7–1.9 mm × 0.85–1.00 mm, slightly concave above, rounded-obtuse and without hyaline hair-points at the apex; margins mostly plane, slightly recurved near base, entire or somewhat denticulate; costa disappearing below the leaf apex; upper leaf cells quadrate to subquadrate, ca. 9–10 µm wide, minutely papillose, with slightly sinuose walls, unistratose at margins; median cells short-rectangular, 11–18 µm × 7–8 µm, sinuosely thick-walled, papillose, unistratose at margins; basal cells rectangular to elongate-rectangular, 20–46 µm × 6–8 µm, walls sinuosely thickened, often papillose; alar cells differentiated into a group of inflated, thin-walled, yellowish cells, ca. 20–30 µm × 12–16 µm. Sporophytes not seen in Chinese material.
 
 
 
 
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