Description: Start your search for this lichen in churchyards where there may be some granite used as kerbing for the graves. The kerbing will have needed years of exposure to attract this species which forms thin, grey crusts over the surface, frequently ringed by circles of black prothallus. The thallus is pitted with fleck-like soralia. The soredia are P+ orange; this separates it from the more ubiquitous P. tuberculosa which has its soredia in tiny, scattered heaps. On hard crystalline, acid rocks.

Key Identification Features:

• Thin, grey thallus on granitic rocks with abundant tiny, flecks of dish-shaped (excavate) soredia
• Soredia: Pd+ orange.

Original text submitted by Vince J. Giavarini

Distribution Map from NBN: Porpidia soredizodes at National Biodiversity Network mapping facility, data for UK.

iNaturalist: Porpidia soredizodes at iNaturalist World Species Observations database.