Rhodothamniella floridula is a perennial brownish red seaweed found on the lower shore. It usually covers large areas of rock in sandy habitats. At the base of the seaweed, filaments bind with sand to form a spongy, carpet like mass. The filaments are well-spaced and branch out up to 3 cm in length. Upright filaments of the seaweed uncovered by the ebbing tide appear as tufts of hair. When plants dry out they have a purplish tinge.