Physciaceae Physcia tribacioides Chemical results: Cortex and medulla K+ yellow Scarce on well-lit, nutrient-rich wayside trees in S England and Ireland. Very rarely recorded from rocks. BLS conservation evaluation: VU C1, D1 NS P Eng Wa S8 Thallus adpressed, the +/- overlapping grey-white lobes without pseudocyphellae. Marginal lobes widen and notched at tips, under surface pale whitish-brown, rhizines sparse. Abundant convex, +/- hemispherical, laminal soralia can cover centre of thallus. Red-brown apothecia rare Similar: Physcia tribacia, cortex K+ yellow, medulla K- and Phaeophyscia orbicularis

Physcia tribacioides
Knoll car park, Studland and on gravestone, East Holme, Dorset. May and December 2015