Plants large to robust, flaccid, green, yellow-green or blackish; aquatic, saxicolous. Stems 50-100 mm long; in section subround, central strand absent, inner cortical cells large, irregularly thickened at corners, outer cortical cells small, round, incrassate. Leaves distant, spreading wet or dry; linear-lanceolate, (3-)4-7 mm long, somewhat flexuous above; apex acute to obtuse; margins elimbate, plane, entire to wavy; costa ending well below apex. Vaginant laminae 1/4 to 1/3 of leaf length, equal or termination of one blade submarginal; dorsal lamina abruptly tapering proximally, not reaching stem. Laminal cells irregular, rectangular to hexagonal, 18-37 µm long, 12-15 µm wide, thin-walled, flat; juxtacostal cells somewhat larger, rectangular. Autoicous, gametangia on short lateral branches. Seta very short, 0.4 mm long; capsule erect, urn elliptical, 0.5 mm long; peristome cleft and perforated; operculum rostrate; spores round, 18-20 µm.
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Plants large, flaccid, yellow-green to blackish. Stems 50-100 mm long. Leaves distant, narrowly linear-lanceolate, 3-7 mm long; apex acute to obtuse; margins elimbate, plane, entire; costa ending well below apex. Vaginant laminae equal or minor blade terminating submarginal; dorsal lamina not reaching stem. Upper laminal cells irregular, rectangular to hexagonal, thin-walled, flat. Capsule erect, elliptical, seta very short.
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