Plants long and slender, forming floating mats, green to dark green; aquatic and saxicolous. Stems up to 400 mm long, branching irregular, somewhat fasciculate; in section round to oval, central strand absent, inner cortical cells thin-walled, large, hyaline, outer cortical cells thick-walled and yellow, becoming smaller and reddish toward margin; axillary hairs with brown basal cells. Leaves evenly spaced, spreading wet, appressed dry, concave; stem leaves ovate-lanceolate, 3.5-4.5 mm long; acute to obtuse, weakly decurrent at base; margins plane to weakly inflexed, entire, weakly bordered, marginal cells not differing in shape but with a faint yellowish colour; branch leaves similar to stem leaves although somewhat smaller, 3-4 mm long. Costa absent or a few bistratose areas at extreme base of leaves. Upper laminal cells linear, somewhat fusiform, homogeneous, 110-125 µm long, 8-10 µm wide, walls thin, smooth; basal cells rectangular, forming distinct group at insertion, reddish brownish, smooth; alar cells strongly differentiated, enlarged and inflated, reddish, walls thin. Sporophyte not known from Flora area.
Home