Whitewash Lichen -BOG

Whitewash Lichen/ Phlyctis argena (Spreng.) Flotow
Class: Ascomycetes Family:Phlyctidaceae

-The name “whitewash lichen” is certainly fitting—this looks like dull white paint. It occurs in a thin layer (crustose) on tree bark (corticolous), on many different deciduous and some cone-bearing trees, in both open and sheltered conditions. It is found on red maple and cedar, for example. It does not have any apothecia (fancy lichen talk for fruiting bodies).
-Thallus a white to grey crust, reacting yellow to slowly red with KOH, with diffuse, extensive, pale greenish soralia that erode leaving raised lines. Widespread and common on bark, sometimes on walls.