Cylindrical cartilaginous fronds is a common and widely distributed algae found on rocks and stones in lower intertidal and subtidal pools. It can range from brownish red to pale olive-green in sunny habitats and can grow up to 250 mm high. Features of this algae include a main axis which is not constricted, it is solid, it is irregularly branched and the ends of the branchlets have soft crowded ovoid ramuli which themselves occasionally bear ramuli filled with a watery mucilage. It is also attached by branching rhizoidal filaments.