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Acadia National Park Algae on rocks near shoreline
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Acadia National Park
Field Guide to Algae - Benthic Diatom
Navicula growing on rock

Navicula sp.
Navicula sp. is a tube-dwelling diatom that is particularly abundant in spring from the high to the lower intertidal zone. The outer covering of each diatom, which is a single cell, is made of two silica valves (“shells”); diatoms live in “glass houses.” This diatom often fools experts, because it can look like a filamentous brown alga.

Photos by Sarah Hall.

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Last Updated: February 11, 2009 at 13:49 MST