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Published In: Monographs in Systematic Botany from the Missouri Botanical Garden 90: 369. 2002. (Monogr. Syst. Bot. Missouri Bot. Gard.) Name publication detail

Project Name Data (Last Modified On 2/22/2011)
Acceptance : Accepted
Project data     (Last Modified On 2/22/2011)

Bryum rudimentale is gametophytically identical to B. argenteum. It differs from that species in having an erect capsule and an endostome with rudimentary or absent segments and cilia. Ochi (1980, 1994) considered this taxon the same as Bryum petelottii  Thér. & Henry but that species has fully developed segments and relatively well‑developed cilia. Bryum insolitum Card. (Mexico and South America), another erect capsuled species in the argenteum‑complex, differs from B. rudimentale in having a fully formed endostome and narrower capsules. Bryum insolitum seems to differ from B. petelottii only in its narrower capsules, and this is a variable feature within the argenteum-complex of species.

Illustrations: Figure 153 A–D.
Habitat: On rock or masonry walls, concrete gutters or terrestrial at base of trees; 1100‑1524 m.
Distribution in Central America: COSTA RICA. San José: Grayum 10013 (MO).
World Range: Central America.


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Bryum rudimentale Allen nom. & stat. nov.

Bryum insolitum var. brachycarpum Bartr., J. Washington Acad. Sci. 24: 473. 1934. Protologue: Costa Rica. [San José:] Tiribi, 1100 m., Oct. 28, 1933, A. Alfaro 21 (NY, US).  

Plants small, silvery‑green, in loose tufts, 6–7 mm high; rhizoids papillose, not matted. Leaves to 1.0 mm long, imbricate with erect or recurved apices when dry, imbricate when wet, concave, not decurrent; apices broadly ovate, apiculate to filiform‑acuminate; margins plane or recurved below, not or weakly bordered, nearly entire; costae slender, percurrent or excurrent; upper cells elongate, hyaline, firm‑walled, basal cells sub‑quadrate to short‑rectangular, green, thick‑walled. Dioicous. Setae 10–25 mm long, red. Capsules 1–2.5 mm long, ovate to oblong, erect, light-brown becoming red with age; exothecial cells below the mouth strongly differentiated in 10 or more rows; opercula 0.3‑0.5 mm long, conic-apiculate; annuli compound and revoluble; exostome teeth lightly papillose, light-brown, 200–450 μm high, endostome yellowish to hyaline, basal membrane high, to _ the exostome length, segments and cilia rudimentary to absent. Spores 10–14 μm, smooth to faintly papillose. Calyptra not seen.



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