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Published In: Revue Bryologique 36: 71. 1909. (Rev. Bryol.) Name publication detailView in BotanicusView in Biodiversity Heritage Library

Project Name Data (Last Modified On 2/15/2011)
Acceptance : Accepted
Project data     (Last Modified On 2/15/2011)

Husnotiella has long been recognized (Grout 1939, Bartram 1949, Crum & Anderson 1981) on the basis of its stem hyalodermis, broadly rounded, elliptic leaves, and thick, spurred costa that has a single stereid band as well as enlarged, quadrate, green, papillose cells on the ventral surface. As noted by Crum and Anderson (1981) the costae of Husnotiella and Trichostomopsis are similar in form and structure. Trichostomopsis differs from Husnotiella in having lax, bulging basal leaf cells, non-spurred costae, and acute to acuminate leaves. Williams (1922) and Zander (1981, 1993, 1994a) synonomized Husnotiella with Didymodon. When considered synonymous with Didymodon the Central American species of Husnotiella (H. revolutus) and Trichostomopsis (T. australasiae) are often treated (see Zander 1993) in Didymodon sect. Asteriscium.


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

Plants small, dull, green to yellow-green above, brown below, in tufts. Stems erect, sparsely and irregularly branched, hyalodermis of somewhat enlarged, thin-walled cells, central strand present; rhizoids sparse. Axillary hairs with brown basal cell. Leaves lingulate to elliptic or ovate, erect, imbricate-incurved when dry, broadly channeled on ventral surface; apices rounded-obtuse to cucullate; lamina unistratose or with bistratose areas along the margins; margins entire, recurved to revolute to near the apex; costa subpercurrent, broad, spurred above midleaf, upper surface ventral cells of costa quadrate, guide cells and single (dorsal) stereid bands present, ventral surface cell layer of enlarged, bulging, papillose cells; upper and basal cells differentiated, upper cells rounded-quadrate to rhomboidal or oblate firm-walled, with 1–2(–3) large papillae, basal cells short-rectangular, firm-walled, smooth, alar cells not differentiated. Dioicous. Perichaetia terminal, perigonia gemmiform. Setae elongate. Capsules elliptic to cylindrical; exothecial cells rectangular, firm-walled; stomata in neck; opercula erect, obliquely short-rostrate; annuli vesiculose; peristome absent to rudimentary with erect, papillose teeth and basal membrane absent. Spores  smooth. Calyptrae cucullate.

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