Abstract
In a survey of macroscopic, benthic, marine algae, the known distributions ofDesmotrichum undulatum, Dictyosiphon foeniculaceus, Striaria attenuata, andCallithamnion roseum along the Atlantic Coast of North America have been extended southward to Accomack County, Va. In the same region of this survey, there is a markedly seasonal alternation of species. The winter flora is composed predominantly of members in the division Phaeophyta and the summer flora is composed of a majority of species in the division Rhodophyta.

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