Pertusaria corallina

Revised name: Lepra corallina

A crustose species that forms a thick, white to pale grey thalli, usually with a white prothallus. The surface of the thallus becomes covered in white isidia, which can be short and rounded, but are, when well developed, coralloid and up to 2 mm long.

Thallus: C-, K+ yellow to yellow-orange, UV-

In Scotland, Pertusaria corallina is widespread and common on dry, siliceous rocks in upland and coastal areas. It is frequently found on dykes. BLS distribution map

Pertusaria corallina is distinguished from Pertusaria pseudocorallina by its lighter colour, and the often cylindrical isidia that lack brown tips.