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Helicodontium (Mitt.) A. Jaeger 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: Bericht über die Thätigkeit der St. Gallischen Naturwissenschaftlichen Gesellschaft 1876–77: 224. (Gen. Sp. Musc. 2: 290). 1878. (Ber. Thätigk. St. Gallischen Naturwiss. Ges.) Name publication detail
 

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Notes     (Last Modified On 3/27/2009)
general taxon notes:
Currently, there are about 21 species of Helicodontium in the world with eight better-known species (Crosby et al. 2000). Two species are recognized in China.
 

 

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4. Helicodontium (Mitt.) Jaeg. 旋齿藓属 xuan-chi xian shu
Ber. Thatigk. St. Gallischen Naturwiss. Ges. 1876–77: 224. 1878. Hypnum sect. Helicodontium Mitt., J. Linn. Soc., Bot. 12: 545. 1869.
 
Plants slender, delicate, dark green, not glossy, in creeping mats. Stems prostrate, irregularly branched; branches short, ascending or arcuate, densely foliate; rhizoids sparse; central strand not differentiated. Leaves ovate- lanceolate, acuminate above; leaf margins plane, entire below, toothed above; costa slender, ending in the middle or above leaf middle; leaf cells oblong-elliptic or oblong-hexagonal; alar cells quadrate, in several rows. Autoicous. Inner perichaetial leaves sheathing at base. Setae short, 5–7 mm long, slender, reddish brown, twisted when dry, smooth or papillose; capsules ovoid or shortly cylindrical, constricted below the mouth; annuli persistent; opercula shortly rostrate; peristome double; exostome teeth lanceolate, yellowish brown, keeled, with zig-zag median line; endostome segments linear, as long as exostome teeth, smooth or finely papillose; basal membrane low. Calyptrae cucullate, smooth. Spores spherical, smooth.
 
 

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1. Plants slender; seta papillose; spores 10–15 µm in diameter...............................................1. H. doii
1. Plants delicate; seta smooth; spores 20–25 µm in diameter....................................2. H. formosicum
 
 
 
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