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.