Hypodontium dregei (Hornsch.) Müll.Hal.

Plants medium to large, forming dense cushions, glaucous-green to olive-green; saxicolous or corticolous. Stems 10-30 mm tall, frequently weakly tomentose; in section round, central strand small, weak, inner cortical cells in 4-5 rows, large, thickened, yellowish red, outer cortical cells in 1-2 rows, substereids or incrassate, reddish. Leaves contorted dry, erect-spreading wet; narrowly lingulate above oval, hyaline base, 4-5 mm long; apex acute; margins entire, involute above mid-leaf, plane below, narrow border of elongate, hyaline cells ending below involute portion of margin or infrequently extending into involute region, 2-6 cells wide in base, 1-2 cells wide at mid-leaf. Costa mucronate, ventral surface flat or convex; in section subround, guide cells 4-6, large, ventral stereid band 2-3 cells thick, occasionally substereids, ventral surface cells large, incrassate, strongly papillose, dorsal stereid band strong, 5-6 cells thick, dorsal surface cells incrassate, smooth, cells near junction of costa and lamina strongly papillose or spinose. Upper laminal cells quadrate, ventral surface with long, massive, bifid papillae, to 18 µm tall, dorsal surface with low, blunt papillae; marginal cells in involute region smooth; basal cells rectangular, hyaline, weakly papillose in upper base, smooth below. Perichaetia terminal, leaves highly differentiated, subulate above long-sheathing base, 5-6 mm long, apices frequently reaching capsule base. Seta erect, 5-6 mm long, yellowish; capsule short-cylindrical, 1.6-2.0 mm long, yellow-brown; peristome teeth 16, triangular, 0.25 mm long, smooth, red-yellow, frequently with weak properistomal thickenings; operculum rostrate, 1 mm long; calyptra cucullate, 3 mm long; spores round, 35-45 µm, irregularly granulate.