Tropicos | Name - !Brachymitrion jamesonii Taylor

Cent. Amer. Moss > Splachnaceae > Brachymitrion > Brachymitrion jamesonii

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!Brachymitrion jamesonii Taylor

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Project Name Data (Last Modified On 2/18/2011)

Acceptance : Accepted

Project data (Last Modified On 2/18/2011)

Discussion:

Brachymitrion jamesonii has apiculate, oblong-obovate, strongly bordered leaves and crenate leaf margins. The leaves of B. moritzianum differ from those of B. jamesonii in their spathulate shape, spinose-toothed margins and multicellular awns. Brachymitrion cochabambae like B. jamesonii has bordered leaves, but it differs in having spathulate leaves, a weaker leaf border, and shorter costae.

The rhizoidal initials in this species are in the internodal region of the stem while in B. moritzianum and B. cochabambae they are found on the stem at the base of the leaves.

Illustrations: Thériot (1932, Fig. 6); Koponen and Weber (1972, Figs. 11–16); Sharp et al. (1994, Fig. 336). Figure 118.

Habitat: Plants terrestrial, at base of tree.

Distribution in Central America: GUATEMALA. Chimaltenango: Standley 61932e (F); San Marcos: Sharp 5477 (MO, NY). COSTA RICA. Heredia: Lemmon 93 (MO); San José: Holz CR99-510 (GOET).

World Range: Mexico; Central America; Western and Northern South America; West Central Tropical Africa.

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Brachymitrion jamesonii Tayl., London J. Bot. 5: 44. 1846.

Eremodon jamesonii (Tayl.) Wils., London J. Bot. 5: 454. 1846. Tayloria jamesonii (Tayl.) C. Müll., Syn. Musc. Frond. 1: 135. 1848. Protologue: Ecuador. n. 333. Woods of Pichincha, near Quito, Prof. W. Jameson, 1845.

Orthomnium mexicanum Thér., Rev. Bryol. Lichénol. 5: 103. 1933. Tayloria mexicana (Thér.) Bartr., Bryologist 49: 115. 1946. Protologue: Mexico. Zacatales prope Chapulin, inter Mexico et Cuernavaca; associé à Timmiella anomala (leg. G. Woronow n°594). Huitzilac, pentes, des massifs de l’Ajusco, 2.000 m., bords de la plaine chaude; associé à Rhacopilum tomentosum (leg M. Saint-Pierre n° 1882).

Plants pale green to grayish green. Stems erect, forked at base, 10–30 mm, central strand present; rhizoids branched, dimorphic, red, originating on internodal regions of the stem, papillose; axillary hairs with 2–3 red, cylindrical, basal cells, terminal cell hyaline, elliptical. Leaves erect, wide-spreading when moist, basal portion erect, the upper half variously contorted with margins inrolled when dry, decurrent, oblong-obovate, 2.5–5.0 x 0.8–1.2 mm; apices apiculate, apiculus multicellular at base with apical cell short-pointed; margins plane or somewhat inrolled below, crenulate above; costa single, percurrent to subpercurrent, yellowish; upper cells 44–75 x 17–26 μm, irregularly hexagonal-¬fusiform, basal cells rectangular 75–119 x 25–38 μm, border in the upper portion of the leaf of 3–7 rows of rectangular, hyaline cells, 62–125 x 20–35 μm. Autoicous. Perigonia axillary, minute, bud-like. Setae 2–3.5 mm long, smooth, yellow or yellowish brown, twisted. Capsules erect, cylindric, 2–3 mm long, emergent to shortly exserted, yellowish tan or light-olive, becoming reddish brown in age, lightly longitudinally striate, urn slightly contracted below the reddish suboral rim; exothecial cells in longitudinal rows, 50–112 x 22–31 μm, irregularly rectangular, suborally oblate in 6–8 rows, 20–30 x 10–15 μm; stomata phaneroporic; peristome of 16 exostome teeth, pale orange-brown or red-brown, narrowly triangular, incurved, fused at the apex, outer surface papillose, interior surface striate. Spores spherical, 16–20 ¬μm, finely papillose. Calyptrae cucullate, 4–6 mm, lobed, scabrous.