Low, creeping, mat forming plant with slender stems rooting at the nodes. Leaves small, rounded having principal veins raised on lower surface. Flowers very tiny, pinkish, unisexual at the base of the leaves.

Damp stone walls, steps and greenhouses and often around houses and gardens.

Flowers May to August.

Evergreen perennial.

Fairly frequent throughout Britain, especially in the south-west.

Fairly frequent and almost certainly under recorded in Leicestershire and Rutland. In the 1979 Flora survey of Leicestershire it was found in 4 of the 617 tetrads.