Devaleraea firma

Flattened sea sac

Authority: (Postels & Ruprecht) Selivanova

Thallus is reddish purple, with a dozen or more hollow, compressed blades arising from the margin of a central linear sac, all tapering to a short stipe. The thallus, attached by a small discoidal holdfast, reaches 8 cm (3 in) tall but is usually shorter.

Habitat

This annual or biennial species usually grows on rock (including cobble) in the low intertidal to upper subtidal of protected to semi-exposed habitats.