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Published In: Species Muscorum Frondosorum 162–163. 1801. (Sp. Musc. Frond.) Name publication detailView in BotanicusView in Biodiversity Heritage Library

Project Name Data (Last Modified On 3/9/2011)
Acceptance : Accepted
Project data     (Last Modified On 3/9/2011)

There are six species of Orthotrichum in Central America and although capsule characters are of great importance in the taxonomy of the genus many of the species can be recognized by a combination of gametophytic characters and habitat preference. The genus is not often collected in Central America and only O. pariatum, O. pycnophyllum, and O. rhytiore are known in Central America outside of western Guatemala. Five of the six species have been treated in detail by Lewinsky (1984, 1987) and Vitt (1994). Lewinsky (1993) published a world-wide synopsis of Orthotrichum.


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Orthotrichum Hedw., Sp. Musc. Frond. 162. 1801. 1818.

Orthomitrium Lewinsky-Haapasaari & Crosby, Novon 6: 2. 1996, syn. nov.

Plants small to medium-sized plants in cushions or tufts, olive‑green above, brownish below, sparsely tomentose at stem base. Stems erect to ascending. Leaves erect‑appressed, contorted-appressed or contorted‑flexuose, spreading to recurved when moist, ovate, oblong‑lanceolate, lanceolate or linear‑lanceolate, at times keeled; apices acute to obtuse or acuminate; margins reflexed or revolute, sometimes plane, entire or dentate at the apex; costae strong, subpercurrent to percurrent; upper leaf cells irregularly rounded, incrassate, papillose, basal leaf cells elongate, thin‑walled or thick‑walled and nodose, smooth. Gonioautoicous, cladautoicous or dioicous. Setae erect. Capsules immersed, emergent, or exserted, erect, ovoid to cylindrical, smooth, 8 or 16 ribbed, or puckered at mouth; stomata superficial or immersed; peristome double, single or absent, exostome teeth 8 or 16, endostome segments 8 or 16. Spores isosporous, papillose. Calyptrae conic‑mitrate, naked or hairy, smooth or papillose.


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