Plants green to brown, sometimes tinged with purple, freely branched, with many stolons. Stems 0.15-0.25 mm in diameter. Rhizoids abundant, usually brown or purple, spreading from the stem. Leaves nearly orbicular or slightly wider or narrower than long, 0.4-1.0 mm long and wide, plane, or more often concave, narrowed to the rather short, steeply oblique insertion, shortly decurrent dorsally. Cells in mid-leaf 20-27(-30) µm wide x 23-35 µm long, the walls ± pigmented, trigones variable in size but sharply defined, the largest from the middle to the base of the leaf; cuticle smooth or finely granulose; oil bodies rough, Jungermannia-type, 2-6 per cell. Dioicous. Androecia on long shoots, bracts in 2-5 pairs, resembling the leaves but usually smaller and more concave, and saccate near the base. Perianths emergent and completely free from the bracts (perigynium absent), pyriform, with 4-5 blunt keels in the upper half, the apex abruptly rounded to the mouth, the cells bordering the mouth 15-20 µm wide x 40-50 µm long, the cells in the middle of the perianth ca. 23 µm wide x 29 µm long. More concave, and saccate near the base. Perianths emergent and completely free from the bracts (perigynium absent), pyriform, with 4-5 blunt keels in the upper half, the apex abruptly rounded to the mouth, the cells bordering the mouth 15-20 µm wide x 40-50 µm long, the cells in the middle of the perianth ca. 23 µm wide x 29 µm long.
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