Umbilicaria mammulata

Common Names: Smooth rock tripe
Category: Lichens
Sub-category: Foliose

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.

Edible Notes: This lichen is edible but not generally considered desirable. An hour of boiling is said to convert this leather-like lichen into an edible source of protein, palatable by itself or when added to soup or stews. Soak for 2-3 hours first to remove acids that might caused digestive upset. Many say it tastes like shoe leather. Not recommended..
Warnings: Not known to be dangerous.