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Published In: Contributio ad Floram Cryptogamam Asiae Boreali-Orientalis 244. 1872. (Contr. Fl. Crypt. As.) 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 brevisetum Lindb. (Figs. 10–20.)
Map: Racomitrium brevisetum Lindb. (Distribution in China)

Distribution     (Last Modified On 5/4/2009)
Distribution:
Habitat: on rocks in shade or thin soil over rocks, sometimes on sandy soil.
Distribution: China, Korea, Japan, and Russia.
 

Specimens Examined     (Last Modified On 5/4/2009)
Specimens Examined:
Chinese specimens examined: Anhui: Mt. Huangshan, D.-K. Li 588 (SHM). Chongqing: Nan-chuan Co., Mt. Jinfo, T. Cao & Q. Li 41615 (IFSBH). Fujian: De-hua Co., D.-K. Li & C.-H. Gao 21889 (SHM). Guizhou: Jiang-kou Co., Mt. Fanjing, C. Gao & J.-Y. Feng 32641 (IFSBH). Heilongjiang: Ning-an Co., Da-hai-lin, C. Gao & G.-C. Zhang 9212 (IFSBH). Jiangxi: Mt. Lushan, D.-K. Li 17365 (SHM). Jilin: Mt. Changbai, Koponen 36812 (H, IFSBH). Sichuan: Mt. Omei, C. Gao et al. 19369 (IFSBH). Zhejiang: Mt. Jiulong, R.-L. Hong & Z.-L. Liu 179 (SHM); Mt. West Tianmu, S.-K. Li 3764 (SHM).
 

Notes     (Last Modified On 5/4/2009)
general taxon notes:
The characteristics of Racomitrium brevisetum are: 1) small plants, usually only up to 2 cm long, with sparsely and irregularly branched stems; 2) broadly and shortly ovate leaves without hyaline hair-points; 3) costa weaker, only about 2/3–3/4 the leaf length; 4) upper and median leaf cells short, with forked papillae; and 5) setae short, about 4–6 mm long. Noguchi (1974) considered Racomitrium brevisetum to be identifical to R. fasciculare var. brachyphyllum and recognized this taxon at the varietal level by placing an older name under a newer one. While we agree that they are the same, the taxon should be recognized at the species rank in our opinion. Racomitrium brevisetum is closely related to R. aquaticum (Brid. ex Schrad.) Brid. in overall leaf shape and similar leaf cells with forked papillae, but it differs from the latter in having a much weaker costa, reaching only ca. 2/3–3/4 the leaf length. Racomitrium aquaticum has a percurrent costa.

 

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5. Racomitrium brevisetum Lindb.   短柄砂藓   duan-bing sha xian
Contr. Fl. Crypt. As. 244. 1872. Grimmia breviseta (Lindb.) Lindb. & Arn., Kongl. Svenska Vetenskapsakad. Handl. 23(10): 102. 1890. Type. Russia: Sakhalin, July 1860, Schmidt s.n.
Racomitrium fasciculare var. brachyphyllum Card., Bull. Herb. Boissier, ser. 2, 8: 334. 1908.
 
Plants stiff, small or sometimes medium-sized, up to 2(–3) cm long, green above, dark brownish below, in loose tufts. Stems creeping or sometimes ascending, sparsely and irregularly branched; central strand absent. Leaves loosely imbricate, slightly secund when dry, erect-spreading when moist, broadly ovate-lanceolate, somewhat concave and keeled above, plicate below, 2.4–2.7 mm long, bluntly acuminate, occasionally with denticulate apex; margins recurved on both sides; costa slender, extending up to 2/3–3/4 the leaf length; upper leaf cells short-rectangular, 7–12 µm × 6–7 µm, sinuosely thick-walled, coarsely papillose, often with forked papillae, unistratose at margins; median cells rectangular, 9–23 µm × 5–7 µm, sinuosely thick-walled, papillose; basal cells elongate-rectangular to linear, 18–40 µm × 4–5 µm, strongly sinuosely thick-walled, nearly smooth; alar cells not differentiated, with only a row of hyaline, thin-walled, rectangular cells on the basal margins, 12–18 µm × 5–8 µm. Perichaetial leaves larger than stem leaves. Setae short, 4–6 mm long, erect, brownish, twisted when dry; capsules erect, ovoid, ca. 1.5–1.6 mm long; opercula long rostrate; peristome teeth linear-lanceolate, reddish brown, divided to the base. Spores small, 9–12 µm in diameter, yellowish, minutely papillose.
 
 
 
 
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