Description: This crustose calcicole inhabits a similar niche to Gyalecta jenensis on shaded, naturally occurring, vertical, limestone rock. The K-, cracked thallus is highly conspicuous in its white colour and densely frosted (pruinose) surface. The deeply concave discs (2-5mm diam.) are frequent. Well recorded in the Burren (County Clare) but rather rare throughout rest of Ireland.

Key Identification Features:

• White, cracked crust, densely pruinose on sheltered, natural vertical limestone outcrops
• Thallus K-; discs concave, often with Gyalecta jenensis.

Original text submitted by Vince J. Giavarini

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

iNaturalist: Diploschistes gypsaceus at iNaturalist World Species Observations database.