Halosaccion sp.

Ephemeral sea sac

Authority: undesribed

Thallus is saccate, with or without a short stipe, nearly spherical to elliptical, and reaches 3.5 cm (1.4 in) tall and 2.1 cm (0.8 in) wide although usually smaller, and growing singly or in clusters. Color is dark rose pink. Thallus is very thin and easily tears.

Habitat

This ephemeral is known only from late spring collections growing on Devaleraea callophylloides and Palmaria hecatensis in the lower mid interidal of semi-exposed habitats.