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Published In: Annales des Sciences Naturelles; Botanique, sér. 5, 4(6): 342. 1865. (Ann. Sci. Nat., Bot., sér. 5,) Name publication detailView in Biodiversity Heritage Library
 

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Acceptance : Accepted
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Discussion:

Bryum microchaeton has ovate‑lanceolate, narrowly acuminate leaves with long, thin-walled leaf cells, margins revolute throughout, and mostly percurrent costae. Bryum subapiculatum differs from it in having shorter, firm- to thick-walled leaf cells, plane and serrulate leaf margins, and a more excurrent costa. Bryum apiculatum differs from it in having broadly acute, apiculate leaves with margins plane, erect, or occasionally reflexed below, and a stronger, shortly excurrent costa.

This species, described from Central America as Pohlia peracuminata, shows the difficulty in cleanly separating Bryum and Pohlia. There are no technical characters keeping the Central American material of this species out of Pohlia, and indeed, its long leaf cells, unbordered leaves, percurrent costa, and nodose cilia suggest that genus. On the other hand, all these character states can also occur in Bryum. The presence in material of B. microchaeton from outside Central America of more strongly revolute leaf margins, shortly and stoutly excurrent costae, and a weakly developed leaf limbidium place the species in Bryum.

Illustrations: Bartram (1949, Fig.  72 A–C); Ochi (1980, Fig. 29); Sharp et al. (1994, Fig. 353 a–g). Figure 148 E–H.
Habitat: On soil of burned over fields, trail banks and trunk of Alnus; 940–3505 m.
Distribution in Central America: GUATEMALA. Baja Verapaz: Sharp 5158 (TENN); Huehuetenango: Sharp 4780a (TENN); San Marcos: Sharp 5451a (TENN).
World Range: Southeastern U.S.A.; Mexico; Central America; Western and Southern South America; South-Central Pacific.

 

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Bryum microchaeton Hampe, Ann. Sci. Nat., Bot. sér 5, 4: 342. 1865.

Protologue: Columbia. Bogota, Guadalupe 2900 metr., ad Barrancos, inter alia intermixturm, augusto 1863, A. Lindig. parce legit.

Pohlia peracuminata Bartr., Bryologist 50: 206. 1947. Protologue: Guatemala. Dept. Huehuetenango: bank of trail, pass above Todos Santos, alt. 11000 ft., A.J. Sharp 4780a (TENN). 

Plants small to medium-sized, lustrous, yellowish green to reddish yellow, in loose tufts to 10 mm high; rhizoids papillose. Leaves 1–2 mm long, erect and well‑spaced below, erect‑imbricate and crowded at apex, ovate‑lanceolate; apices long, slenderly acuminate; margins revolute throughout, not bordered, minutely denticulate at apex; costae percurrent to somewhat excurrent; upper cells linear‑rhomboidal to fusiform, lax, thin‑walled, 50–90 μm long, basal cells laxer with bulging walls, short‑rectangular, 40–60 μm long. Dioicous. Setae 12–30 mm long, red. Capsules 3 mm long, brown, oblong‑cylindrical, inclined to pendent, neck weakly constricted and roughened; opercula 0.5 mm long, conic-apiculate; exostome teeth orange below, yellow above, densely papillose, endostome yellowish hyaline, lightly papillose, basal membrane to ½ of exostome teeth length, segments well-developed, broadly perforate, cilia 2, nodose. Spores 12–16 μm, lightly roughened. Calyptra not seen.

 

 

 
 
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