Colonies consist of clumps of interlocking tubular corallites which are less than 4 millimetres diameter. Clumps may be compact and attached to hard substrates or loose aggregations on soft substrates which readily fall apart if disturbed. Usually only the terminal parts of corallites are alive. Corallite walls and septo-costae are both thin and delicate. The latter are in two alternating orders and have irregular teeth.
Tan or brown, with translucent tentacles.
Seagrass beds and other turbid environments where there is a lot of sediment.