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Published In: Journal of Bryology 7: 301. 1973. (J. Bryol.) Name publication detail

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Bryum erythroloma is a small to medium-sized Bryum with strongly decurrent, obovate to spathulate leaves, well‑developed leaf limbidia, shortly excurrent to percurrent costae, and lax leaf cells. In Central America B. erythroloma has a somewhat attenuate habit, unlike plants from British Columbia which are sub‑rosulate. It is a segregate of the capillare‑complex and differs from all other Central American species in the complex by its strongly decurrent leaves. Bryum capillare differs further in having a long-excurrent costa, while B. pseudocapillare differs in having axillary filamentous gemmae and a weakly developed leaf border. Bryum limbatum and B. erythroloma are somewhat similar, but B. limbatum occurs on rocks in or along streams and has broadly acute, non‑decurrent leaves.

Syed (1973), unable to locate type material for B. capillare ssp. erythroloma, designated a neotype for this taxon. He chose a Macoun specimen from Cedar Hill, Vancouver Island which coincidentally appears to be a syntype for B. capillare var. brevicuspidatum.

Illustrations: Syed (1973, Figs. 18–19); Sharp et al. (1994, Fig. 363). Figure 143 I–L.
Habitat: On soil; 1250–1750 m.
Distribution in Central America: COSTA RICA. Alajuela: Crosby 3798 (MO); Cartago: King C‑74‑046E (MO); San José: Crosby 9716 (MO).
World Range: Western Canada, Northwestern and Southwestern U.S.A.; Mexico; Central America.


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Bryum erythroloma (Kindb.) Syed, J. Bryol. 7: 301. 1973.

Bryum capillare ssp. erythroloma Kindb., Eur. N. Amer. Bryin. 2: 358. 1897. Protologue: Canada. Can. Vanc. isl.: Macoun 1892. Neotype: Canada, British Columbia, Cedar Hill, April 1887, Macoun (Syed 1973).

Bryum capillare var. brevicuspidatum Kindb., Cat. Canad. Pl., Musci 6: 131. 1892. Protologue: Canada. Canadian Musci, No. 180, Bases of stumps near Victoria (1875) and at Cedar Hill (1887),Vancouver Island. Macoun (MO).

Plants small to medium-sized, shiny, green to yellow‑green, sometimes reddish, in loose tufts 5–20 mm high; rhizoids papillose; brown to reddish brown, smooth tubers sometimes present. Leaves 1.5–3 mm long, spirally twisted when dry, erect‑spreading when wet, obovate‑spathulate, long-decurrent; apices mucronate to cuspidate; margins recurved below, plane above, distinctly bordered by 3–4 rows of narrow, long‑rectangular cells, serrulate above; costae reddish, short-excurrent to percurrent; upper cells rhomboidal to hexagonal, thin‑walled, 30–60 μm long, basal cells rectangular, thin‑walled, bulging 30–70 μm long. Dioicous. Setae to 10–20 mm long, reddish brown. Capsules 2–4 mm long, red, oblong‑cylindrical, pendent, neck short and narrowed to the seta; opercula 0.5 mm long, conic apiculate; exostome teeth yellow to reddish brown, densely papillose, endostome hyaline, lightly papillose, basal membrane to ½ of exostome teeth length, segments well-developed, broadly perforate, cilia 2‑5, appendiculate. Spores 9–12 μm, nearly smooth. Calyptra not seen.


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