In the distant past, an algae, a fungus, and a cyanobacteria (and rumor has it, a basidiomycetes) teamed up to form LICHEN! Useful as wildlife food, habitat for micro-critters, industrial dyes, medicines, and more, you WANT these growing on your rocks and trees! Brave the cold for our quick scavenger hunt. Part of our monthly “Art & Science in the Park” series. Masks and registration required. Meet at Blackstone Field, across from the Narragansett Boat Club (2 River Drive, Providence, RI 02906).