Leptodon smithii (Hedw.) F.Weber & D.Mohr

Plants medium-sized, gregarious or forming loose tufts, dark green to green or yellow-green; corticolous or saxicolous. Primary stems creeping; secondary stem erect, 20-50 mm long, branching regular above stipe, dense, twice-pinnate in single plane; in section oval, central strand absent, inner cortical cells thin-walled, hyaline, in 5 or 6 rows, outer cortical cells smaller, yellow, thick-walled, in 3-5 rows; axil lary hairs numerous, to 9 per axil, 3 cells long, basal cell brownish; paraphyllia numerous, branched, multicellular but not foliose, smooth; pseudoparaphyllia foliose. Leaves evenly spaced, spreading wet, weakly crisped dry; stem leaves ovate to elliptical, 1-2 mm long; obtuse to acute; rounded and narrowed to insertion, weakly decurrent; margins plane, entire; branch leaves smaller but similar in other respects to stem leaves, 0.5-1.0 mm long. Costa single, extending to midleaf or ending below apex, ventral and dorsal surface smooth, cells elongate; in section elliptical and bulging dorsally, cells undifferentiated, in three rows. Upper laminal cells quadrate to rectangular or rhombic to transversely rectangular, somewhat heterogeneous, 15-32 µm long, 15 µm wide, walls weakly thickened, smooth; basal cells rec tangular, to 40 µm long, 10-15 µm wide, greenish, walls incrassate, ± wavy, smooth; alar cells quadrate, yellowish, walls ± incrassate. Perigonia gemmate; perigonial leaves broadly ovate-acuminate, 1.0-1.2 mm long. Perichaetia strongly differentiated; perichaetial leaves lanceolate-subulate, 3.0-3.5 mm long, leaf cells linear and somewhat sigmoid, rectangular at margins, thickened. Seta 0.5-2.0 mm long, yellow, smooth; vaginula sometimes as long as seta, hairy, 0.6 mm long. Capsule exserted, erect, short ellipsoid, 1.2-1.6 mm long, smooth, brownish; neck not differentiated; exothecial cells rectangular, somewhat irregular, walls weakly thickened, cells at mouth quadrate to transversely rectangular; annulus absent; stomata absent. Peristome double, whitish to yellowish; exostome teeth narrowly triangular, inflexed dry, erect wet, weakly papillose, with median zigzag line, 250-280 µm high; endostome segments and cilia absent; basal membrane low, rudimentary. Operculum curved-rostrate, 0.5 mm long. Calyptra campanulate-mitrate, 2.0-2.5 mm long, hairy. Spores rounded, 15-20 µm, granulate, brown.