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Published In: Species Muscorum Frondosorum, Supplementum Secundum 2(2): 152. 1827. (Sp. Musc. Frond., Suppl. 2) Name publication detail

Project Name Data (Last Modified On 2/18/2011)
Acceptance : Accepted
Project data     (Last Modified On 2/18/2011)

Acidodontium, with 11 species (Ochi 1992), is restricted to the neotropics. The gametophytes of Acidodontium are nearly inseparable from some large species of Bryum or Brachymenium. The genus is based on sporophytic features. Its capsules are generally erect and have long, slender, abruptly constricted necks, the operculum is hemispheric and only occasionally apiculate. Its exostome teeth are broad in the lower _ then abruptly constricted to slender filaments, and the dorsal (outer) trabeculae project laterally, i.e., in the direction of the adjacent teeth. The endostome in Acidodontium has a high basal membrane with broad segments that are completely split along the keel and laterally divergent in the direction of the adjacent segments. Although the above suite of sporophytic characters neatly circumscribes the genus, a related form of its odd endostome is found in Brachymenium columbicum where the segments are split along the keel and divergent, but in this case each ½ segment is fully united with the adjacent cilia and ½ segment. An endostome nearly identical to that of Acidodontium is also found in the Bartramiaceae (Bartramia, Breutelia, Philonotis, and Plagiopus).


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Acidodontium Schwaegr., Sp. Musc. Frond., Suppl. 2(2): 152. 1827, nom. cons. 

Bryum sect. Acidodontium (Schwaegr.) C. Müll., Syn. Musc. Frond. 1: 241. 1848. 

Plants medium to robust, in dense or loose tufts, simple or forked. Leaves erect, erect‑spreading, or spreading when wet, oblong, oblong-lanceolate or lanceolate, often decurrent; apices acuminate; margins plane, or narrowly recurved below, entire to serrate or denticulate near apex; costa subpercurrent to excurrent; cells smooth, firm‑walled, often porose, upper cells rhomboid‑hexagonal, elongate rhomboidal or fusiform, basal cells quadrate to long‑rectangular. Setae elongate, straight. Capsules clavate-pyriform, erect to horizontal, symmetric, smooth, neck abruptly narrowed, long and slender; opercula hemispheric, sometimes apiculate; annuli large, compound, deciduous; stomata superficial; peristome double, exostome of 16 narrowly triangular teeth, abruptly narrowed above to slender filaments, papillose, yellowish red below, hyaline above; endostome yellow, papillose, basal membrane high, well‑developed, segments broad, split fully along the keel, each half strongly divergent, cilia rudimentary or absent. Spores spherical, papillose. Calyptra not seen.

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