Bull's Eye Lichen

Thallus pinkish-white to yellowish-brown, often turning pale green at the edges when wet; large brown spots containing the cyanobacteria are almost always present near the center of the round thallus. Scattered apothecia are pink to brown disks with a white rim. On rock in open areas. Often a primary invader of newly exposed rock surfaces like roadsides and glacial areas. Three species of Placopsis occur in this region.