Porina scabrida

Porina scabrida is a species of crustose lichen in the family Porinaceae. First described in 1995 by American lichenologist Richard C. Harris, it is characterized by its pale olive-tan crustose thallus with distinctive cylindrical isidia. The species is found in eastern North America, ranging from Ontario, Canada through the southeastern United States, where it grows primarily on tree bark in humid environments such as hardwood-cypress swamps and mesic forests. It can be found at various elevations from sea level up to 435 m (1,427 ft), typically in protected areas but occasionally in disturbed habitats. The species was distributed to major herbaria as part of the "Lichens of Eastern North America Exsiccati" collection....read more on Wikipedia.