algae

Microplastics in lakes and ponds can cause algae to grow out of control — depriving fish and other aquatic life of oxygen.

Visitors to beaches in the Paynetown and Fairfax State Recreation Areas are advised to thoroughly clean themselves after contact with water.

If I asked you what lichen was, you might say that it's a symbiotic organism that's made up of fungus joined with algae or cyanobacteria. This is what scientists would have said from 1867 up until recently.