Acrosiphonia coalita is a species of green algae.
Description The green thallus forms many long "rope-like strands from branched, uniseriate filaments. Branching is lateral, from sides of cells, and cells are longer than broad. The frayed rope appearance is caused by hook-shaped branches that entangle neighboring branches to form the rope-like strands;" the North Pacific distribution is from the Gulf of Alaska to central California.
Habitat The species is found on rock in the mid- to low intertidal in protected to semi-exposed habitats in spring and early summer.
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