Once labeled invasive, ‘rock snot’ algae now deemed native

MONTPELIER, Vt. — A type of algae called “rock snot” that was thought to be an invasive species in the Northeast is actually native to the northern United States, researchers have concluded. The aquatic algae, Didymosphenia geminata, has caused massive blooms in some U.S. rivers. Fishermen spotted it in rivers in Vermont in 2007, sparking