Barbula microcalycina Magill

Plants small to medium, loosely caespitose, yellow-green to light green, glaucous-green dry, brownish below; terricolous or saxicolous. Stems 8-20 mm high, thin, branching by subperichaetial innovations; in section round, central strand present, small, frequently collapsed, inner cortical cells large, thickened, outer cortical cells in 1-3 rows, stereids, reddish. Leaves about equal throughout, incurved dry, widely spreading to squarrose above clasping base wet, weakly keeled; broadly lanceolate to ligulate above obovate base, 1.5-2.5 mm long; apex broadly acute to obtuse, mucronate; base sheathing; margins plane, entire. Costa short-excurrent, strong, ventral superficial cells quadrate to short-rectangular, papillose, dorsal superficial cells quadrate to short-rectangular, incrassate, papillose; in section subround, guide cells 4, ventral stereid band strong, in rounded group, 4 cells thick, ventral surface cells similar to laminal cells, papillose, dorsal stereid band strong, 4 cells thick, dorsal surface cells incrassate, papillose. Upper laminal cells rounded, quadrate, incrassate, papillae 4-6 over cell, low, simple or sometimes C-shaped, obscuring cells; basal cells highly differentiated, upper basal cells rectangular or fusiform, seriate papillose, lower basal cells rectangular, hyaline, thin-walled, smooth. Dioicous. Perichaetia terminal, leaves differentiated, 1.2-1.5 mm long; lanceolate to acuminate above long-oblong, sheathing base, papillose above. Seta 10-15 mm long, yellow; capsule cylindrical, 1.8 mm long, with very short neck, yellowish red; peristome present, teeth irregularly cleft to base, 75 µm long, straight, papillose, reddish yellow; operculum short-conic, 0.5-1.0 mm long, cells weakly twisted counter-clockwise; calyptra cucullate, to 3.5 mm long, twisted below, spores round, 12-15 µm, smooth.