Common Names: Smooth rock tripe
A foliose lichen found on boulders and rock walls. Among the largest lichens in the world. The smooth upper surface is a reddish-brown to grayish-brown color and the lower surface is pitch black.
This species is found on boulders and steep rock walls in forests and around lakes. It grows on several types of rock substrate, such as acid rock, sandstone, quartz, and granitic rock.