Pertusaria mccroryae

Pertusaria mccroryae is a species of white or greenish-white crustose lichen. It is found in northwestern North America (Alaska, British Columbia, Idaho, Oregon, and Montana), in forests with old trees. It grows from low elevation to 1700 m on the bark of living trees (Picea sitchensis, Thuja plicata, and Tsuga heterophylla) or on logs, and is named in honor of Colleen McCrory, a Canadian environmental activist. The spore size and the chemistry distinguish it from other members of the genus.