Abstract
The thallus surface of Dermatocarpon was studied by transmission and scanning electron microscopy. Comparisons were made with the surface covering in representative species of Catapyrenium and Peltula. Two types of surface coverings were observed in Dermatocarpon, both similar to the epinecral layer types described in Peltula. One type consists of compressed hyphae and the other of non-compressed, air filled, more or less isodiametric cells or cell rem- nants. The latter type may cause the surface to appear pruinose and has often been referred to as a pruina in Dermatocarpon. Investigations of the pruina of Catapyrenium species also revealed an epinecral layer. In Dermatocarpon, a member of the Verrucari- aceae characterized by foliose habit, the color of the upper surface varies between brown and gray. The gray color is sometimes a property of the upper cortex of the thallus. In other instances a whitish
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