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Published In: Species Muscorum Frondosorum, Supplementum Primum 1(1): 33. 1811. (Sp. Musc. Frond., Suppl. 1) Name publication detailView in Biodiversity Heritage Library

Project Name Data (Last Modified On 2/15/2011)
Acceptance : Accepted
Project data     (Last Modified On 2/15/2011)
Discussion: Anoectangium is a genus of 49 species (Crosby et al. 2000) distributed throughout the world. Distinctive features of the genus include its stem central strand, lateral perichaetia, strongly keeled leaves, and single (dorsal) stereid band in the costa. The costa in cross-section has only 2–3 enlarged, smooth cells on the upper, ventral surface and since a ventral stereid band is absent these cells apparently represent guide cells. Anoectangium is traditionally placed in the Tribe Pleuroweisieae along with Molendoa on the basis of its lateral perichaetial. Norris and Koponen (1989) suggested that the position of the perichaetia in this genus could be the result of lateral displacement by a branch below the very young perichaetia. Zander (1993) considered the Pleuroweisieae polyphyletic and has distributed the five genera into four tribes. He places Anoectangium in the Merceyoideae tribe Barbuleae near Gyroweisia which also has a single stereid band in its costa. Zander (1977) provided a detailed treatment of the genus in Middle America.


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Anoectangium Schwaegr., Sp. Musc. Frond. Suppl. 1(1): 33. 1811.

Plants small, tufted, yellow-green. Stems erect, sparsely and irregularly branched, sclerodermis present, central strand present; rhizoids moderately developed at base. Leaves lingulate to ovate-lanceolate, keeled, erect at base, appressed-incurved above when dry, spreading when wet, obtuse to acute; lamina unistratose; margins crenulate above, plane; costa percurrent, mucronate, guide cells and single (dorsal) stereid band present, ventral surface layer with 2–3 enlarged, smooth cells; upper cells quadrate to oblate, firm-walled,  pluripapillose, papillae low, simple or granular, centered or scattered, occasionally fused into a single massive papilla, basal cells weakly differentiated, short-rectangular, firm-walled,  hyaline, smooth, alar cells not differentiated. Dioicous. Perichaetia lateral. Setae elongate. Capsules ellipsoid; stomata in neck; opercula rostrate; annuli weakly vesiculose; peristome absent. Spores granulate. Calyptrae cucullate, smooth.

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