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Identifying Pacific Seaweeds

Branched Filaments

Acrosiphonia Green rope

Class Ulvophyceae Order Ulotrichales Family Ulotrichaceae

Number of Species

Of the 13 Acrosiphonia (Greek=tube-topped) species worldwide, three species are found in our area: A. duriuscula, A. coalita and A. arcta.

Description

Typically, the attached and branched plants form rope-like strands that result from hooked branches tangling the thread-like filaments together. Often these hooked filaments can be seen with the aid of a magnifying glass. More conspicuous forms may reach 40 cm (16 in) in length. This group of multi-nucleate plants (many nuclei per cell) has been associated with a ‘Codiolum’-like phase (see Urospora, p. 53).

Habitat & Distribution

Plants are often abundant in the mid- and low intertidal regions, distributed from Alaska to central California.

Acrosiphonia coalita.

Acrosiphonia coalita and detail (right) showing characteristic hooks.