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!Racomitrium laetum Besch. & Cardot Search in The Plant ListSearch in NYBG Virtual HerbariumSearch in Muséum national d'Histoire naturelleSearch in Type Specimen Register of the U.S. National HerbariumSearch in Virtual Herbaria AustriaSearch in JSTOR Plant ScienceSearch in SEINetSearch in African Plants Database at Geneva Botanical Garden Decrease font Increase font Restore font
 

Published In: Bulletin de l'Herbier Boissier, sér. 2 8: 335. 1908. (30 Apr 1908) (Bull. Herb. Boissier, sér. 2,) Name publication detailView in Biodiversity Heritage Library
 

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: Noguchi 1988, Fig. 156B (as Racomitrium heterostichum var. diminutum).

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Map: Racomitrium laetum Besch. & Cardot (Distribution in China)

Distribution     (Last Modified On 3/16/2009)
Distribution:
Habitat: on rocks or sandy soil.
Distribution: China, Korea, and Japan.
 

Specimens Examined     (Last Modified On 3/16/2009)
Specimens Examined:
Chinese specimens examined: Anhui: She Co., R.-L. Hu 186 (IFSBH). Guangxi: Long-sheng Co., C. Gao 1852-3 (IFSBH, MO). Jiangxi: Yi-feng Co., Nan-da Univ. 1 (IFSBH). Jilin: Mt. Changbai, C. Gao 1060, 1049 (IFSBH). Liaoning: Kuan-dian Co., T. Cao & S.-Z. Wang 38350 (IFSBH). Sichuan: Xiang-cheng Co., S. He 31786 (MO). Taiwan: Hua-lien Co., Shevock 14431 (CAS, MO); Wonju-shui Co., Shevock 16221 (CAS, MO); Tai-tung Co., S.-H. Lin s.n. [Bryophytes of Taiwan Exsiccatae ser. 5, no. 143] (MO). Xizang: Mo-tuo Co., Y.-G. Su 1829 (HKAS, MO); Ya-dong Co., Ding-wa, M. Zang 804 (HKAS). Yunnan: De-qian Co., X.-J. Li 81-1919 (HKAS); Fu-gong Co., D.-C. Zhang 890 (HKAS); Gong-shan Co., M.-Z. Wang 9450d (PE); Li-jiang Co., M. Zang 1748 (HKAS); Zhong-dian Co., X.-J. Li 81-1387e (HKAS).
 

Notes     (Last Modified On 3/16/2009)
general taxon notes:
Racomitrium laetum is characterized by long, slender, sparsely branched stems, narrowly lanceolate leaves, recurved leaf margins that are usually on one side and extended to 1/3–1/2 the leaf length, and leaf cells unistratose at margins. Racomitrium laetum has been treated as a synonym of Racomitrium heterostichum var. diminutum by Noguchi (1988). However, Frisvoll (1988) treated it as an acceptable species and placed Racomitrium diminutum under its synonymy. Indeed, both species were published by Cardot (1908) in the same treatment. Noguchi (1988) and Frisvoll (1988) considered they were identical, and we have the same opinion, but we follow Frisvoll’s treatment of the taxa at the species level.

 

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16. Racomitrium laetum Besch. & Card.   多枝砂藓   dou-zhi sha xian
Bull. Herb. Boissier, ser. 2, 8: 335. 1908. Syntypes. Japan: Nikko, Faurie 504, 506, 515; Sobosan, Faurie 732; Ichifusa, Faurie 1060; Ubayu, Faurie 2812; Komagatake, Faurie 3471; Tokachiyama, Faurie 3384; Korea: Pomasa, Faurie 238; Quelpaert, Faurie 87, 611, 630, 720.
Racomitrium heterostichum var. diminutum (Card.) Nog., Misc. Bryol. Lichenol. 1(15): 1. 1958. Racomitrium diminutum Card., Bull. Herb. Boissier, ser. 2, 8: 335. 1908.
Racomitrium sakuraii Broth. ex Sak., Bot. Mag. (Tokyo) 51: 137. 1937.
 
Plants large to rather robust, 6–10 cm long, yellowish green above, brownish green below, in large, loose cushions. Stems sparsely irregularly branched; central strand absent. Leaves imbricately appressed, slightly secund when dry, erect-spreading when moist, narrowly lanceolate, keeled above, 1.5–3.0 mm long, hyaline hair-points long, dentate and decurrent; margins recurved on one side, ca. 1/3–1/2 the leaf length, plane or narrowly and short-recurved on the other side, unistratose at margins; costa strong, percurrent, convex on the dorsal side; leaf cells unistratose throughout, strongly sinuosely thick-walled, upper cells subquadrate to shortly rectangular, 7–17 µm × 10–11 µm; median cells rectangular, 9–28 µm × 7–8 µm; basal cells narrowly rectangular, 23–47 µm × 8 µm; alar cells not differentiated, with a row of 12–20, shortly rectangular, hyaline cells, walls straight. Perichaetial leaves rounded ovate, without hair-points. Setae erect, 3.0–3.5 mm long; capsules ovoid, 1.0–1.4 mm long; opercula long-rostrate; peristome teeth linear-lanceolate, divided to the base, densely papillose. Calyptrae mitrate. Spores spherical, 14–16 µm in diameter.
 
 
 


 

 
 
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