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Procumbent or ascending, loosely radiculose, branching; leaves semi-vertical, roundish-elliptic, inequilateral, the sinus and unequal lobes obtuse; perianth terminal or at length dorsal, oval or pyriform, smooth, the mouth connivent; capsule oblong.—On sterile ground and rocks, N. J.

Embryo curved, nearly enclosing a little gelatinous albumen; cotyledons folded and crumpled.—Leaves pointed, petioled, inequilateral.

A simple vertical elevation of the occiput, giving the head in most instances a squared and inequilateral form.

The spores are sub-elliptical, sometimes inequilateral, and measure from 8–12 × 4–6 µ.

Under the microscope they are yellowish, oval or short oblong, often inequilateral, 6–8 × 4–5 µ.