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Published In: Bryologia Universa 2: 663. 1827. (Bryol. Univ.) Name publication detail

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

Manuel (1980), on the basis of morphological and cytological evidence, removed Pyrrhobryum from Rhizogonium; the circumscription of the genus was further sharpened by Koponen et al. (1986). The genus presently contains 9 species (Koponen et al. 1986) all of which are medium-sized, yellowish‑green plants with reduced and well-spaced basal leaves, distichous upper leaves, uniseriate leaf margins, smooth costae and basal perichaetia. Koponen (1988) further separated Pyrrhobryum from Rhizogonium by placing them into different families (Mniaceae and Rhizogoniaceae).


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Rhizogonium Brid., Bryol. Univ. 2: 644. 1827.

Medium-sized plants in light-green or yellowish tufts. Stems erect, simple or branched at base, moderately tomentose either along stems or at the stem bases; rhizoids reddish‑brown. Basal leaves reduced and distant, upper leaves distichous, ovate to elliptic; margins unistratose or multistratose, not bordered or weakly bordered by elongate cells, singly toothed; costae single, subpercurrent to excurrent, smooth at back, with two stereid bands; upper cells small, quadrate, rounded‑hexagonal to rectangular, thick‑walled, smooth. Dioicous. Perichaetia bud‑like, at base of stems. Seta elongate. Capsules exserted, suberect, smooth; opercula short rostrate; annuli well-developed, cells vesiculose; exostome of 16 narrowly triangular teeth, papillose throughout; endostome basal membrane well-developed, segments narrow, cilia stout, 2–3. Calyptra unknown (?).


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