Squamulose lichen

A squamulose lichen is a lichen that is composed usually overlapping "scales" called squamules. If they appear raise from the substrate and appear leafy, the lichen may appear to be a foliose lichen, but the underside does not have a "skin" (cortex), as foliose lichens do. Squamulose lichens are composed of flattish units that are usually tightly clustered. They are like a mix between a crustose lichen and a foliose.