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Published In: Journal of the Linnean Society, Botany 12: 304. 1869. (J. Linn. Soc., Bot.) Name publication detailView in BotanicusView in Biodiversity Heritage Library

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Bryum chryseum is a small moss with imbricate leaves and long, slender apices that are spreading to recurved when dry. In size and aspect it is nearly identical to the lanatum‑form of Bryum argenteum. It differs in having a lustrous golden‑yellow color, stouter costae, quadrate stem epidermal cells, and narrowly clavate capsules. Ochi (1994) considered it similar to Brachymenium acuminatum or B. fabronioides on the basis of its leaf shape, quadrate alar cells, and endostome with short segments and cilia. The presence in this species of closely imbricate, concave leaves that are much the same wet or dry and sublinear upper cells is sometimes considered an indication of a relationship to Anomobryum (Ochi 1994). All the above features, however, also occur in the argenteum‑group of Bryum species, and it is to this group that B. chryseum seems related.

Illustrations: Bartram (1949, Fig. 76 H–L); Ochi (1980,  Fig. 35 A–H); Sharp et al. (1994, Fig. 356 a–g). Figure 141 A–D.
Habitat: On soil, volcanic sand or limestone bluffs; 1828–2590 m.
Distribution in Central America: GUATEMALA. Chimaltenango: Godman & Salvin 304 (NY); Huehuetenango: Sharp 4847 (F); Jutiapa: Standley 78450 (F); Quezaltenango: Sharp 2323 (MO). EL SALVADOR. La Unión: Davidse et al. 37359 (BM, ITIC, LAGU, MO). HONDURAS. Comayagua: Olson 84‑66d (MO).
World Range: Mexico; Central America; Western and Southern South America.


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Bryum chryseum Mitt., J. Linn. Soc., Bot. 12: 304. 1869.

Protologue: Guatemala. Volcan de Fuego, Godman & Salvin 304 (NY).  

Bryum guatemalense Hampe ex C. Müll., Bull. Herb. Boiss. 5: 182. 1897. Protologue: Guatemala: Bernoulli sine loco speciali in Hb. Hmp.(BM, Ochi 1980).

Plants small, golden‑yellow, lustrous, in loose tufts, 3–5 mm high; rhizoids sparse. Leaves 0.7–1.0 mm long, imbricate with long, recurved apices when dry, imbricate when wet, concave, broadly ovate to deltoid; apices filiform‑acuminate; margins recurved below, plane or narrowly recurved above, not bordered, entire or lightly crenulate above, somewhat decurrent; costae  long-excurrent, denticulate at apex; upper cells narrowly rhomboidal, firm‑walled, 44–90 μm long, basal cells quadrate to short‑rectangular, thick‑walled, 12–18 μm long. Dioicous. Setae 15–25 mm long, red. Capsules 2.5–4 mm long, narrowly clavate, neck slender and constricted, horizontal to inclined, light-brown becoming red with age; opercula 0.5 mm long, conic‑mammillate; annuli compound and revoluble; exostome teeth papillose, light-brown 350 μm high, endostome 320 μm high, yellowish to hyaline, basal membrane high, segments broad, widely perforate below, abruptly narrowing above, lightly papillose, cilia short to rudimentary, nodose. Spores 10–13 μm, faintly papillose. Calyptra not seen.



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