lichen-Physcia americana

Physcia americana

Physcia americana

Physcia americana photo by Ray Showman

DIAGNOSTIC FEATURES:  Small size; light gray with very white circular soralia clustered toward center of thallus; cortex and medulla K+ yellow; compare with Dirinaria frostii which has undersurface black and is found on rocks and P. caesia, on rock, maculate, with undersurface fibrous.

ECOLOGY:  Widespread in the eastern US; common in Ohio, usually found on ash or white oak, more rarely on rock.

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