Order: Lecanorales Family: Physciaceae
Species: Physcia tribacioides
Photos: On urban trees. Macroom and Bandon, Co. Cork, SW Ireland. Identification confirmed by John Douglass
Thallus irregular or forming radiating patches. Adpressed, crowded, +/- overlapping lobes are greyish-white when dry, pseudocyphellae absent. Marginal lobes widening and notched at tips, under surfaces pale whitish-brown with sparse rhizines. Abundant convex, +/- hemispherical, laminal soralia can become confluent covering centre of thallus. Apothecia are rare, discs reddish-brown.
Found on well-lit, nutrient-rich wayside trees in the south of Ireland. Cortex and medulla K+ yellow
Similar: Physcia tribacia
Physcia tribacioides November 2009. Fertile specimen May 2010