Plants long, light to dark green; aquatic to semi-aquatic, tufaceous saxicolous (didymodontoliths). Stems flaccid, to 50 mm long, green to blackish; in section round, central strand very small, of 4-5 cells, inner cortical cells lax, outer cortical cells in 2-3 rows, smaller, incrassate. Leaves distant, lax, spreading, frequently lime-encrusted; broadly lanceolate to triangular-lanceolate, 2-3 mm long; apex obtuse; margins plane, entire, frequently indistinctly bordered. Costa ending 2-5 cells below apex or percurrent, ventral and dorsal superficial cells rectangular, smooth; in section subround, guide cells 4, ventral stereid band small, 1-2 cells thick over central guide cells, ventral surface cells larger, incrassate, dorsal stereid band 3-4 cells thick, dorsal surface cells larger, incrassate. Upper laminal cells hexagonal, quadrate or short-rectangular, superficially bulging, smooth or occasionally with 1-2 indistinct papillae in upper leaf; marginal cells in 4-5 rows, narrower, weakly incrassate, rectangular to quadrate; in section frequently forming indistinct, elliptical border; basal cells elongate-rectangular, becoming somewhat narrower toward margin. Gemmae axillary, multicellular, fusiform, brown or green. Sporophyte unknown.
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Stems to 3.5 cm. Leaves lax when wet, short-ligulate to long-elliptic, 2-2.7 mm, base scarcely differ-entiated to ovate, not sheathing, margins plane or weakly recurved in proximal 1/2 to 3/4, apex narrowly to broadly obtuse, occasionally broadly acute, entire or weakly apiculate; costa percurrent to ending 2-3 cells before the apex, abaxial costal surface smooth, hydroids absent; distal laminal cells lax-walled, short-rectangular, 11-15 µm wide, 1-2:1, smooth or with low, simple papillae. Specialized asexual reproduction by fusiform or armed gemmae borne on stalks in leaf axils, to 185 µm. Sporophytes absent in the flora area.
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