Calicium laevigatum

About

Calicium laevigatum is a corticolous (bark-dwelling) pin lichen in the family Caliciaceae, recognised by its greenish-grey, warted thallus, slender black stalks that carry brown-pruinose heads, and ascospores ornamented with a striking spiral ridge when young. It produces alectorialic acid as its principal secondary metabolite, a chemistry otherwise unknown in the genus, and molecular data place it as an early-diverging member of the Calicium viride clade.

Summary from Wikipedia