lichen-Placidium arboretum

Placidium arboretum

Placidium arboreum

Placidium arboreum photo by Bob Klips

DIAGNOSTIC FEATURES: Adnate, foliose to squamulose growth habit; embedded perithecia; NIS; on bark. This is the only foliose lichen with perithecia which grows on bark.

ECOLOGY:  Widespread in the eastern US but not commonly collected; records from ten Ohio counties; found exclusively on bark, usually that of white oak.

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