Description: In old, established woodlands consisting of acid-barked trees (for example, oak) on sandy or waterlogged soils, this crustose bark epiphyte forming conspicuous yellowy patches should be present. As it develops, the finely cracked, grey-yellow thallus becomes spotted with tiny dots of yellow, powdery soredia which, in older specimens, may cover the entire thallus. Discs are very rare. The thallus will turn orange with a dab of fresh bleach. Throughout Ireland.

Key Identification Features:

• Grey-yellow, crustose lichen without discs, dotted with powdery, yellow soredia sometimes spreading to cover the whole thallus; C + orange
• It is important to note that this species begins as an areolate (cracked into little islands of thallus) crust and progressively becomes more sorediate with age. This attribute will separate it from all lookalikes which lack the areolate stage.

Original text submitted by Vince J. Giavarini

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

iNaturalist: Lecanora alboflavida at iNaturalist World Species Observations database.