Physcia tenella

Description:

A very small, foliose lichen. The lobes have long marginal cilia and usually with terminal soralia on the turned up undersides of the mature lobe-tips. The lobe surfaces are often dotted with black pycnidia; apothecia frequent, shortly-stalked with blue-black or thinly pruinose discs. Widespread and often abundant on twigs, bark, walls and rocks, often in company with P. adscendens, Phaeophyscia orbicularis and Xanthoria species, as indicators of nitrogen enrichment. Now often the dominant lichen on trunks of trees urban areas.

Habitat:

On a little twig of a Helm oak

Notes:

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