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Thuidium Bruch & Schimp. Search in The Plant ListSearch in Index Nominum Genericorum (ING)Search in NYBG Virtual HerbariumSearch in JSTOR Plant ScienceSearch in SEINetSearch in African Plants Database at Geneva Botanical Garden Decrease font Increase font Restore font
 

Published In: Bryologia Europaea 5: 157 (fasc. 49–51. Mon. 1.). 1852. (Bryol. Eur.) Name publication detail
 

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general taxon notes:
Thuidium is characterized by its regularly pinnately branched plants, its differentiated stem and branch leaves, its abundant paraphyllia on stems and branches, and its densely papillose leaf cells. Thuidium is the largest genus in the Thuidiaceae. Cardot and Thériot (1904) were probably the first authors dealing with the occurrences of two Thuidium species: Thuidium japonicum Dozy & Molk. and T. pycnothallum C. Müll. from China. Subsequent papers concerning the studies of the Chinese Thuidium were published by a number of authors (Brotherus 1925; Bartram 1935; P.-C. Chen & P.-C.. Wu 1965; P.-C. Chen et al. 1978; Dixon 1933; C. Gao 1977; X.-Y. Hu & P.-C. Wu 1991; Y. Jia et al. 1995; X.-J. Li (editor-in-chief) 1985; Redfearn & P.-C. Wu 1986; Reimers 1931; Potier de la Varde 1937; B.-C. Tan et al. 1994; B.-C. Tan & Y. Jia 1997; Watanabe 1964, 1980; P.-C. Wu et al. 1984, 1987; P.-C. Wu 1992; B.-S. Xu (editor-in-chief) 1989; C.-Y. Yang 1936; B.-Y. Yang & W.-C. Lee 1964; M.-X. Zhang 1978). Recently, Redfearn et al. (1996) enumerated 13 species and 2 varieties for China. In this study, we recognize 11 species. The occurrence of Thuidium recognitum needs confirmation. Species of Thuidium have been recorded throughout the country except Ningxia province. Most recently, Y.-M. Fang & Koponen (2001) published a new species, Thuidium unipinnatum Y.-M. Fang & Kop. and reported T. kuripanum (Dozy & Molk.) R. Watan. new to China. Unfortunately, we are not able to verify these species.
 
 

 

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14. Thuidium Bruch & Schimp. in B. S. G. 羽藓属 yu xian shu
Bryol. Eur. 5: 157. 1852.
 
Plants medium-sized to robust, green, yellowish green or brownish green, often in loosely interwoven mats. Stems procumbent to climbing, bi- to tripinnately branched; paraphyllia abundant on stems and branches, filamentous or foliose, often papillose; central strand present. Stem leaves and branch leaves differentiated or similar, but different in size; stem leaves ovate or ovate-cordate, usually with slender apex, narrowed at base, decurrent, multiplicate; leaf margins revolute, serrulate above; costa not extending to leaf apex, rarely excurrent; leaf cells isomorphic, mostly hexagonal or rounded to rounded-hexagonal, equally thick-walled, uni- or multipapillose. Primary branch leaves similar to the stem leaves, but smaller; secondary or young branch leaves minute, mostly ovate or oblong-ovate, concave; leaf margins erect; costa weak and short. Autoicous or dioicous. Perichaetial leaves lanceolate or ovate-lanceolate, with slender apices, sometimes leaf margins with long cilia; costa ending at leaf apex or slightly excurrent; leaf cells rectangular, smooth or papillose. Setae slender, smooth or densely papillose above; capsules horizontal or declining, ovoid or cylindrical, slightly curved, brownish, smooth; annuli 2–3 rows, revolute, deciduous; opercula acute to conical, obliquely beaked; stomata present; peristome double; exostome teeth yellowish or yellowish brown; basal membrane high, at least 1/3 the length of endostome segments; cilia 2–4, mostly nodulose, rarely rudimentary or lacking. Calyptrae cucullate or campanulate, smooth, rarely scabrous.
 
 

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1. Stem leaves mostly ovate or widely ovate, with obtuse or shortly acuminate apices............................2
1. Stem leaves usually triangular or cordate, with long, narrowly acuminate apices................................5
2. Leaf cells rhomboidal or oblong, unipapillose.............................................................. 11. T. tamariscinum
2. Leaf cells oval or rhomboidal, multipapillose or stellately papillose, rarely unipapillose........................ 3
3. Central strand undifferentiated; leaf cells stellately papillose...............................8. T. pristocalyx
3. Central strand present; leaf cells with 2–6 coarse papillae, rarely unipapillose.............................. 4
4. Perichaetial leaves not ciliate......................................................................5. T. glaucinoides
4. Perichaetial leaves long ciliate.....................................................................9. T. subglaucinum
5. Plants medium-sized, usually not more than 5 cm long................................................................6
5. Plants large, up to or more than 10 cm long................................................................................7
6. Stem leaves ovate at base, tapering to acuminate above...............................4. T. erosifolium
6. Stem leaves cordate at base, suddenly narrowed to a narrowly lanceolate apex.............. 7. T. plumulosum
7. Costa of stem leaves ending below the apex.....................................................3. T. delicatulum
7. Costa of stem leaves percurrent to excurrent.............................................................................8
8. Stem leaves usually without or with short ciliate apices......................................1. T. assimile
8. Stem leaves usually with long ciliate apices............................................................................ 9
9. Apices of stem leaves long piliferous, consisting of 6–10 uniserriate cells........................ 2. T. cymbifolium
9. Apices of stem leaves shortly piliferous, consisting of 2 multiserriate cells.......................................10
10. Central strand of stems present; stem leaf bases triangular or triangularly ovate; perichaetial leaves ciliate.............................................................................................6. T. kanedae
10. Centra1 strand of stems absent; stem leaf bases cordate or cordate-ovate; perichaetial leaves without cilia...............................................................................................10. T. submicropteris
 
 
 
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