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Published In: Monographs in Systematic Botany from the Missouri Botanical Garden 90: 82. 2002. (Monogr. Syst. Bot. Missouri Bot. Gard.) Name publication detail

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Although H. jacksharpii exhibits considerable gametophytic variation (see Allen 1990), the species typically has long, ovate-lanceolate leaves that are narrowly acuminate, have well-developed decurrencies, and smooth cells. In leaf form, decurrency development and cell ornamentation it resembles some species of Barbula. It differs from Barbula in lacking a stem central strand and in having gymnostomous capsules. The widespread H. recurvirostrum var. insigne (Dix.) Bart. (syn. Gymnostomum subrigidulum (Broth.) Chen) is close to H. jacksharpii in leaf shape, and the presence of thick, porose, sometimes smooth leaf cells, but it differs in having non-decurrent leaves. As evidenced by the above synonymy opinions on the generic placement of H. jacksharpii have varied. Allen (1990) discussed these various generic placements of H. jacksharpii within the framework of a broadly conceived Gymnostomum.

Illustrations: Bartram (1949, Fig. 26 A–C); Crum (1984, Figs. 1–4). Figure 34.
Habitat: On bank of calcareous creek; 2286–2400 m.
Distribution in Central America: GUATEMALA. Huehuetenango: Steyermark 50001 (F).
World Range: Central America.


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Hymenostylium jacksharpii (Crum) Allen, comb. nov.

Barbula jacksharpii Crum, Bryologist 87: 204. 1984. Gymnostomum jacksharpii (Crum) Allen, Bryologist 93: 207. 1990. Protologue: Guatemala. Guatemala, Huehuetenango, above San Juan Ixcoy, “on bank of calcareous creek, 7500 ft alt., A. J. Sharp 4982, Jan. 5, 1946.”

Dicranoweisia calcarea Bartr., Bryologist 49: 111. 1946. Dicranella calcarea (Bartr.) Crum, Bryologist 87: 204. 1984. Protologue: Guatemala. Dept. Huehuetenango: above San Juan Ixcoy, Sierra de los Cuchumatanes, alt. 2400 m., Steyermark 50001

Plants medium-sized to robust, in tufts, lime-encrusted, yellow-green, terricolous. Stems erect, 2–6 cm high, smooth, forked, sclerodermis present, central strand absent; rhizoids red-brown, smooth. Leaves ovate-lanceolate, 2–3 mm long, spreading when wet, loosely spreading with incurved, contorted tips when dry, decurrent; apices long, gradually acuminate to a slender, blunt tip; margins erect to recurved below, entire; costa ending just below the apex to percurrent, dorsal surface smooth, ventral surface smooth, guide cells and two stereid bands present, ventral surface cells not enlarged; upper cells quadrate to subquadrate at the margins, short-rectangular near costa, 10–28 x 8–10 μm, thick-walled, smooth, basal cells short-rectangular at margins, otherwise elongate-rectangular, 36–80 x 4–10 μm, thick-walled, nodose-pitted to straight-walled, smooth, alar cells not differentiated. Dioicous (?); perichaetia terminal, not strongly differentiated. Setae 8–10 mm long, reddish brown, smooth. Capsules exserted, inclined to erect, short cylindrical, 1.5 mm long, smooth, brown; annuli persistent at mouth; peristome absent. Operculum, calyptra, and spores not seen.

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