Waynea californica

Waynea californica is a species of lichen in the family Ramalinaceae. This rare lichen forms small, scale-like patches on oak tree trunks, with an olive-green to brownish-green surface that develops distinctive cup-shaped structures filled with powdery reproductive material. It is known primarily from California, particularly around Big Sur and the Santa Lucia Mountains, with rare reports also from Washington State, where it grows on solitary oak trees in relatively open areas....read more on Wikipedia.