Algae is a ubiquitous feature in waterways throughout the globe, including western North America. Slippery, green epilithic algae is a familiar sight on river rocks. Toxic blue-green algae—cyanobacteria—is a visually interesting, yet worrisome phenomenon. Increasingly prevalent filamentous algae, with its long, voluminous green strands joins the picture, and is presenting new questions for scientists, recreationalists and land managers.
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