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Published In: Journal of the Hattori Botanical Laboratory 54: 183. f. 1. 1983. (J. Hattori Bot. Lab.) Name publication detail

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Acceptance : Accepted
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Bryum richardsii is a medium-sized species with a strongly developed leaf border, denticulate to sharply serrate leaf margins, and evenly foliate to weakly rosulate stems. Its most distinctive feature is presence in the axils of the uppermost leaves of numerous long, slender branchlets that have scale-like leaves. There are three other rosulate Bryum species in Central America (B. canariense, B. leptotorquescens, and B. billarderi) that could be confused with B. richardsii. Bryum canariense differs from it in having short, thick‑walled leaf cells and a scarcely differentiated leaf border. Bryum leptotorquescens differs from B. richardsii in having a weakly developed leaf limbidium, serrulate leaf margins, and a pseudautoicous sexual condition. Bryum billarderi has strongly rosulate plants and further differs from B. richardsii in its non-decurrent leaves, serrulate to serrate leaf margins, and the presence of papillose propagula in the upper leaf axils.

When the rosulate habit of B. richardsii is nearly lacking it might be confused with B. densifolium. Bryum densifolium is a larger plant (20–70 mm high) than B. richardsii with flexuose to loosely twisted leaves, margins often doubly toothed, and somewhat longer leaf cells.

Illustrations: Sharp (1983, Fig. I); Sharp et al. (1994, Fig. 367 a–i). Figure 152 D–G.
Habitat: On humus; 2730 m.
Distribution in Central America: EL SALVADOR. Chalatenango: Sipman et al. 37662 (MO, NY). GUATEMALA. Huehuetenango: Sharp 4951b (TENN).
World Range: Mexico; Central America; Western and Northern South America.


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Bryum richardsii Sharp, J. Hattori Bot. Lab. 54: 183. 1983.

Protologue: Mexico. Oaxaca: Fallen tree trunk, 9000 ft, near rest house below gap in Sierra Juárez toward Tuxtepec, A. J. Sharp 9840, December 26, 1969 (NY).

            Plants medium-sized, dark-green, evenly foliate or weakly rosulate, in tufts to 25 mm high; stems with long, slender flagellate branches in upper leaf axils; rhizoids papillose, dense, forming brownish red tomentum at base of stems. Leaves 2–2.5 mm long, erect, spirally twisted when dry, erect‑spreading when wet, obovate to oblong-obovate; apices acuminate to cuspidate; margins yellow, recurved in lower _, bordered by 2–4 rows of narrow, thick‑walled, linear cells, sharply denticulate to serrate in upper _; costae shortly excurrent; upper cells hexagonal to rhomboidal‑hexagonal, firm‑walled, sometimes porose, 40–60 x 20 μm, basal cells rectangular, thin‑walled, lax.  Dioicous. Sporophytes not seen from Central America. Setae 2–3.5 cm long; capsules 5 mm long, the neck about ¼ the length; cilia of endostome usually paired. Spores 18–22 μm, relatively smooth (Ochi 1994).



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