The tips may be darker in colour than the rest of the pseudotentacles and are slightly swollen and sometimes double-lobed, and the stalks have white rings and dark lines.

The colour of Lebrunia coralligens varies but the pseudotentacles are often the only parts visible and are usually tan or dark grey, or sometimes bluish-green.

[5] Sea anemones of this species have a symbiotic relationship with zooxanthellae, photosynthetic single-celled algae residing within the tissues of the host.

There is a daily rhythm by which the pseudotentacles spread out to expose themselves to light by day and close up at night, at which time the feeding tentacles expand.

Up to fifty planula larvae are released from an adult, each one being approximately 1 mm (0.04 in) long and half that width, with zooxanthellae already present in their tissues.