Halosaccion
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Halosaccion is a genus of red algae belonging to the family Palmariaceae.
Postelsia
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Postelsia palmaeformis, also known as the sea palm or palm seaweed, is a species of kelp and classified within brown algae in the SAR supergroup of eukaryotes. It is the only known species in the genu
Fossil specimen of Postelsiopsis.
Sea palms at low tide, off Pigeon Point, California.
The California mussel (Mytilus californianus), Postelsia's chief animal competitor.