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Published In: Species Muscorum Frondosorum, Supplementum Secundum 2: 102. 1824. (Sp. Musc. Frond., Suppl. 2) Name publication detail

Project Name Data (Last Modified On 3/17/2009)
Acceptance : Accepted
Project Data     (Last Modified On 3/17/2009)
General Reference:

Notes     (Last Modified On 3/17/2009)
general taxon notes:
The genus Tetrodontium consists of two species, T. brownianum (Dicks.) Schwaegr. and T. repandum (Funck.) Schwaegr., in the world. Both species occur in China. They are very rare in China and grow in moist, shaded places in crevices or recesses of cliffs or boulders. Since plants of Tetrodontium are so minute and usually in scattered clumps, locating the protonematal flaps is the first step to find T. brownianum.


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2. Tetrodontium Schwaegr.   小四齿藓属   xiao si-chi xian shu
Sp. Musc. Frond., Suppl. 1, 2(1): 102. 1824.
Plants minute, budlike, dark green or brownish, gregarious or in scattered clumps. Stems very short, erect, simple or branched at base, with a few scale-like leaves and rhizoids at base. Protonematal flaps present or lacking. Leaves erect, crowded on short stems, obscurely in 3 ranks, narrowly ovate to oblong-ovate or oblong-lanceolate, somewhat concave, bluntly acute or acuminate at apex; margins entire or irregularly serrulate near the apex; costa very slender, weak, ending well below leaf apex or sometimes absent; upper and median leaf cells irregularly rhomboidal or irregularly hexagonal, firm, smooth; lower cells narrowly rectangular. Autoicous. Setae elongate, straight or slightly curved, smooth; capsules oblong-ovoid to shortly cylindrical, erect, symmetric, dark brownish, smooth; stomata few on the neck; opercula low-conic; annuli absent; peristome teeth 4, narrowly to broadly triangular, deeply inserted below the mouth. Calyptrae long-conic, covering most of the urns, naked, deeply split. Spores spherical, smooth.

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1. Protonematal flaps present; stems simple, unbranched; leaves broadly ovate, acute at apex; costa slender, ending well below the apex; peristome teeth narrowly triangular............................................ 1. T. brownianum
1. Protonematal flaps lacking; stems producing slender branches at base; leaves ovate-lanceolate, acuminate at apex; costa lacking; peristome teeth shortly and broadly triangular............................................ 2. T. repandum
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