Description: Thallus is profusely branched, dark red to olive brown, reaching 15 cm (6 in) tall. Primary branching is alternate, lateral branches are comblike (pectinate), and branch tips are forcipate. Branches are corticated, and the holdfast is rhizoidal. Habitat: This perennial occurs on rock (occasionally on other algae, sometimes in tidepools) in the mid to low intertidal of semi-exposed habitats. Similar taxa: Ceramium pacificum.