ekspiklav

Calicium quercinum is a distinctive crustose lichen species that forms thin, grayish-white crusts on the bark of oak trees and other hardwoods. This stalked pin lichen produces characteristic black, pin-like fruiting bodies (mazaedia) that rise above the thallus surface, making it readily identifiable in the field. It plays an important ecological role as a pioneer species in forest ecosystems and contributes to nutrient cycling through its symbiotic relationship with photosynthetic algae.