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Published In: Revue Bryologique 36: 73. 1909. (Rev. Bryol.) Name publication detailView in BotanicusView in Biodiversity Heritage Library

Project Name Data (Last Modified On 2/16/2011)
Acceptance : Accepted
Project data     (Last Modified On 2/16/2011)

Trichostomopsis was revised by Robinson (1970) who considered it close to but clearly separated from Barbula on account of its lax basal leaf cells, bistratose upper leaf margins, a single (dorsal) stereid band in the costa, and scarcely twisted peristome teeth. Zander (1978b, 1981, 1993) treated Trichostomopsis in Didymodon; both genera have axillary hairs with short, brown basal cells, a similar leaf areolation, papillae form, and bistratose upper leaf margins. The very lax basal leaf cells, stem hyalodermis, single costal stereid band, and enlarged, bulging, papillose ventral surface cells on the costa of Trichostomopsis support its recognition at the generic level.


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Trichostomopsis Card., Rev. Bryol. 36: 73. 1909.

Barbula sec. Asteriscium C. Müll., Linnaea 42: 342. 1872. Asteriscium (C. Müll.) Hilp., Beih. Bot. Centralbl. 50(3): 618. 1935. 

Plants small, caespitose. Stems erect, sparsely and irregularly branched, hyalodermis and central strand present; rhizoids sparse. Axillary hairs with brown basal cell. Leaves oblong, ovate-lanceolate to lanceolate, incurved-contorted when dry, channeled above on ventral surface; apices  broadly acute; margins bistratose above, usually reflexed; costae subpercurrent to short-excurrent, surface ventral cells quadrate, guide cells and single (dorsal) stereid cells present, ventral surface layer enlarged, bulging, papillose; upper and basal cells differentiated, upper cells rounded  to short-rectangular, firm-walled, pluripapillose, at times with c-shaped papillae, basal cells lax, hyaline, smooth, alar cells not differentiated. Dioicous. Perichaetia and perigonia terminal. Setae smooth, elongate. Capsules cylindrical; exothecial cells short-rectangular, firm-walled; stomata in neck; opercula erect, long-rostrate; annuli vesiculose; peristome teeth short, straight or slightly twisted, basal membrane low. Spores smooth. Calyptrae cucullate.

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