Cyanobacteria or blue-green algae are one of the common types of "algae." Cyanobacteria are common in most freshwaters and live attached to rocks and plants, floating or suspended in the water, or even grow on moist soil. Reports of blue-green algae in the St. Croix River date back to the early 1900s.
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St. Croix Watershed Research Station; Marine on St. Croix, MN 55047
Minnesota Water Research Digital Library