Wolf lichen

Close up of lichen with a dark, black center in a pocket within the lichen.

Original, full size image

Wolf lichen

Wolf lichen (Letharia columbiana). Credit: Jorge Ayón.

Image

Photo By/Credit

Jorge Ayón/USFWS

Facility

Tijuana Slough National Wildlife Refuge

San Diego Bay National Wildlife Refuge

Seal Beach National Wildlife Refuge

San Diego National Wildlife Refuge

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Public Domain

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