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Published In: Species Muscorum Frondosorum, Supplementum Secundum 2(1): 135. 1824. (Sp. Musc. Frond., Suppl. 2) Name publication detail

Project Name Data (Last Modified On 2/24/2011)
Acceptance : Accepted
Project data     (Last Modified On 2/24/2011)

Brotherus (1924) placed Leptotheca in the Aulacomniaceae, but on the basis of its different base chromosome number and more southern distribution Steere (1972) questioned this placement. The genus has been associated with the Rhizogoniaceae (Koponen 1978a; Churchill & Buck 1982) and due to its spinose costa the Mniaceae (Koponen 1988). Although the costa in Rhizogonium is smooth, both genera are similar in overall appearance, and they have mostly unistratose, single-toothed leaves. In their revision of Leptotheca, Churchill and Buck (1982) considered the genus closely related to Rhizogonium.


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Leptotheca Schwaegr., Sp. Musc. Frond. Suppl. 2(1): 135. 1824. 

Aulacomnium sect. Leptotheca Mitt., J. Linn. Soc., Bot. 12: 316. 1869. 

Plants dull or glossy, yellow‑green to brown, in dense tufts. Stems erect, simple; reddish rhizoids densely matted in lower _. Leaves spirally arranged, stiffly erect, erect‑patent to spreading when dry, patent when wet, linear to ovate‑lanceolate or oval, decurrent; apices acute to long‑acuminate; margins plane to recurved below, unistratose, singly toothed, elimbate; costae single, strong, excurrent, toothed at back; upper cells irregularly shaped, isodiametric, hexagonal, rhomboidal, or elongate, thick‑walled, smooth. Uniseriate propagula in upper leaf axils. Dioicous. Setae elongate. Capsules erect to somewhat curved, long‑cylindrical, furrowed; stomata phaneroporic at base of urn; opercula bluntly conic; annuli of 2–3 rows of enlarged, thin‑walled cells; exostome of 16 narrowly triangular teeth, endostome basal membrane well-developed, segments not perforate, cilia 2. Calyptrae cucullate, naked.

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