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Published In: Musci Frondosi Inediti Archipelagi Indici 5: 130. 41. 1847. (Musc. Frond. Ined. Archip. Ind.) 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 japonicum Dozy & Molk. (Figs. 1–10.)
Map: Racomitrium japonicum Dozy & Molk. (Distribution in China)

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

Specimens Examined     (Last Modified On 5/4/2009)
Specimens Examined:
Chinese specimens examined: Anhui: Fu-nan Co., Zhong-gang, D.-K. Li & C.-H. Gao 1750 (SHM); Mt. Dabei, D.-K. Li 20010 (SHM); Mt. Huangshan, B.-Q. Zhou 1021 (PE); Xiu-ning Co., X.-H. Guo 810313 (MO). Fujian: Mt. Wuyi, D.-K. Li & C.-H. Gao 7824 (SHM). Guizhou: Gui-yang City, Guiyang Teachers’ Coll. 140 (IFSBH). Heilongjiang: Ta-he Co., Xin-lin, C. Gao 13131 (IFSBH); Wu-da-lian-chi City, C. Gao 13235 (IFSBH). Henan: Tong-bai Co., C.-Z. Bai 0113 (PE); Xin-yang City, Xinyang Teachers’ Coll. 2147 (PE). Hunan: Chang-sha City, C. Gao 202 (IFSBH); Hui-tong Co., C. Gao et al. 404143 (IFSBH); Mt. Hengshan, Y.-G. Yang 8 (MO). Jiangsu: Chang-shu City, D.-K. Li 17637 (SHM); Ju-rong Co., D.-K. Li 20298 (SHM); Nan-jing City, C.-Y. Chen 1 (IFSBH); Su-zhou City, D.-K. Li 18830 (SHM); Wu Co., D.-K. Li 6788 (SHM); Wu-xi City, Z.-L. Wang 1 (PE); Yi-xing Co., M. Zang 55 (HKAS). Jiangxi: Mt. Jinggang, D.-K. Li & C.-H. Gao 1676 (SHM); Mt. Lushan, C. Gao 40784 (IFSBH); Shang-rao Co., W.-X. Xu s.n. (PE); Yi-yang Co., D.-K. Li 1214 (SHM). Jilin: Mt. Changbai, C. Gao 1079 (IFSBH). Liaoning: Feng-cheng Co., X.-Y. Jia 746 (IFSBH); Kuan-dian Co., C. Gao 8512 (IFSBH); Zhuang-he Co., X.-Y. Jia 880396 (IFSBH). Ningxia: Mt. Niushu, N.-L. Luo 120 (PE). Shaanxi: Mt. Taibai, Z.-P. Wei 6585 (IFSBH, WUK). Shanghai: Mt. Kun, D.-K. Li 01302 (SHM); Mt. Sheshan, D.-K. Li & C.-H. Gao 15046 (SHM); Mt. Tianma, D.-K. Li 1309 (SHM). Sichuan: Rong-cheng Co., P.-C. Chen 1131 (PE). Yunnan: Li-jiang Co., W.-X. Xu 0959 (YUKU). Zhejiang: Heng-zhou City, S.-E. Liu 6735 (IFSBH); Long-tan Co., R.-L. Hu 51 (HSNU); Mt. Jiulong, R.-L. Hong & Z.-L. Liu 215 (HSNU); Mt. Putuo, D.-K. Li & C.-H. Gao 6991 (SHM); Mt. West Tianmu, R.-L. Hu 73 (HSNU).

Notes     (Last Modified On 5/4/2009)
general taxon notes:
Racomitrium japonicum is characterized by having stout, simple to sparsely branched plants, oblong-ovate leaves that are distinctly keeled above, suddenly narrowed to form a dentate, acuminate, short apex, very short hair-points, broadly recurved leaf margins, coarsely papillose basal leaf cells, and distinctly differentiated alar cells. In China and Japan, Racomitrium japonicum is often misidentified as R. canescnes, which has leaves usually only slightly keeled above, a shorter leaf costa, only ca. 2/3 the leaf length, and long hair-points at the apex.


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14. Racomitrium japonicum Dozy & Molk.   东亚砂藓   dong-ya sha xian
Musci Frond. Ined. Archip. Ind. 5: 130. 1847. Grimmia japonica (Dozy & Molk.) Mitt., Trans. Linn. Soc. London, Bot. ser. 2, 3: 158. 1891. Type. Japan: “Japonia, s.a. Siebold.” (holotype L).
Racomitrium barbuloides Card. var. brevipilum Dix., Rev. Bryol. Lichénol. 7: 107. 1934. Type. China: Liaoning (Ryonei), Kobayasi 3967.
Racomitrium canescens var. iwasakii (Okam.) Iishiba, Cat. Mosses Japan 79. 1929. Racomitrium iwasakii Okam., J. Coll. Sci. Imp. Univ. Tokyo 38: 13. 1916.
Racomitrium leptostomoides J. B. Först., Ann. Naturhist. Hofmus. 16: (Notizen) 71. 1901.
Racomitrium subcanescens C. Müll. in Jaeg., Ber. Thätigk. St. Gallischen Naturwiss. Ges. 1877–78: 419. 1880, nom. nud.
Racomitrium szuchuanicum P.-C. Chen, Contr. Inst. Biol. Natl. Centr. Univ. 1: 4. 1943. Type. China: Chongqing City, P.-C. Chen 5166 (holotype PE).
Plants stiff, sometimes stout, 1–3(–4) cm long, green or yellowish above, brownish below, usually in loose patches. Stems erect, simple or sparsely branched; central strand absent. Leaves imbricately appressed, somewhat contorted or spirally arranged when dry, erect-spreading when moist, often reflexed, oblong-ovate, 2.0–2.5 mm × 0.7–1.0 mm, suddenly narrowed to dentate, acuminate apices, often keeled above, somewhat undulate or plicate below, with very short, not papillose hyaline hair-points, sometimes hair-points absent; margins recurved on both sides, unistratose in cross section; costa rather stout, extending to ca. 4/5–5/6 the leaf length, ending below the apex; upper leaf cells rounded-quadrate to subquadrate, 5–7(–9) µm wide, sinuosely thick-walled, with low papillae; median cells short-rectangular, 9–12 µm × 5–7 µm, sinuosely thick-walled, papillose; basal cells elongate-rectangular, 23–46 µm × 4–5 µm, strongly sinuosely thick-walled, with high papillae; alar cells distinctly differentiated, yellowish, consisting of a group of 20 inflated cells, 34–53 µm × 16–23 µm, straight-walled, smooth. Setae erect, reddish brown, ca. 15 mm long; capsules erect, reddish brown, oblong-ovoid, ca. 4–5 mm long; opercula obliquely long-rostrate; peristome teeth linear, divided to the base, reddish brown, 0.7–1.0 mm long, densely papillose. Spores not seen.


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