Plants usually green, little branched, stolons lacking. Rhizoids colourless or slightly tinged with pale brown or pink, towards the apex of the shoot often appressed to the stem, and on the older parts of the shoot spreading downwards. Leaves nearly orbicular or slightly wider or narrower than long, 0.5-1.1(-1.3) mm long and wide, insertion rather narrow, more nearly transverse than in J. borgenii. Cells in mid-leaf ca. 25-35 µm long, with conspicuous trigones; cuticle smooth (sometimes slightly papillose in leaf base). Paroicous. Male bracts closely resembling the leaves. Female bracts sometimes shortly fused with the base of the perianth, but distinct perigynium absent. Perianth broadly obovate, abruptly narrowed to the mouth, but less abruptly than in J. borgenii; often with ventral innovations beneath perianths. Perianth cells (away from the mouth) similar to those of the leaf, 20-25 µm wide x 30 µm long.
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