Physcia stellaris

Description:

Foliose lichen, with lobes without marginal cilia, lobe surfaces ± smooth or with faint white flecks (pseudocyphellae). The centre of the thallus is often warted, with a rather untidy look to the whole thallus. Soralia absent; apothecia with brown to black, thinly pruinose discs, margins regular to somewhat irregular with small, swollen warts or lobes. The yellow lichen could be Candelaria concolor.

Habitat:

Spotted on a twig of Holm oak.

Notes:

Camera Model: NIKON D300. Exposure Time: 1/60 sec.; f/32; ISO Speed Rating: 200. Exposure Bias: 0 EV. Focal Length: 90.0 mm. Flash fired