Antithamnionella pacifica

Hooked skein

Authority: (Harvey) E.M.Wollaston

Thallus is a delicate, uniseriate filament, reaching 15 cm (6 in) tall. Microscopic branches are opposite, usually short and unbranched, with squarish basal cells. The apex is somewhat sinusoidal.

Habitat

This ephemeral seaweed grows on rock and epiphytically in the low intertidal and subtidal of semi-protected to exposed habitats.

North Pacific Distribution

Aleutian Islands, Alaska to Baja California, Mexico; Russia

Former scientific names

Antithamnion pacificum, Antithamnion alternans, Antithamnion asymmetricum, Antithamnion uncinatum, Callithamnion floccosum var. pacificum, Irtugovia pacifica