Yuck! Photos of 'Rock Snot' Algae Infestations

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Credit: Mark S. Hoddle
Didymo, also known as "rock snot," is a type of freshwater algae that clumps on rocks and invades river bottoms.
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Denise Chow

Denise Chow is the Sci-Tech Editor at Live Science. Before joining the LS team in 2013, she spent two years as a staff writer for, where she wrote about rocket launches and covered NASA's final three space shuttle missions. A Canadian transplant, Denise has a bachelor's degree from the University of Toronto, and a master's degree in journalism from New York University. To find out what her latest project is, you can follow Denise on Google+ and Twitter.
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