Order: Lecanorales       Family: Physciaceae Species: Physconia grisea Growth type foliose. Photos: On urban tree-trunks. Macroom, Cork, SW Ireland. Thallus is pale grey or brownish when dry but becomes greener when wet, usually coarsely pruinose. Fan-shaped, overlapping lobes, under surface whitish with pale, simple rhizines (only Physconia species with pale rhizines). Granular soralia may spread to cover the thallus centre. Apothecia are rare. Medulla: K- Found on nutrient-rich and often dusty, rocks, cement and trees. Similar: P. perisidiosa, is isidiate with black, 'bottle-brush' rhizines

Physconia grisea Macroom, Co.Cork. February 2009, May 2010