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Acrosiphonia (Chlorophyceae, seaweed)

Acrosiphonia coalita (previously Spongomorpha coalita) from False Klamath, CA USA
Photo by Cory Janiak posted online

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Acrosiphonia spinescens (previously Spongomorpha spinescens)
Has hook-like branches that cause clumping of filaments together. Similar species A. arcta that lacks hooks. Some authors lump both species as as A. arcta. Recent unpublished work at the Isles of Shoals suggests that they are distinct (A. Mathieson). Image posted online

Acrosiphonia spinescens from the coast of New Hampshire USA
Photo by James Gerweck, University of New Hampshire, Durham USA

Acrosiphonia spinescen from the coast of New Hampshire USA
Photo by James Gerweck, University of New Hampshire, Durham USA

Acrosiphonia duriuscula from Alaska USA
Photograph from 'Seaweeds of Alaska' posted online

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