Description: Strongly photophobic, this lichen inhabits shaded, siliceous, rocky habitats such as the piles of pebbles and boulders deposited around the edges of loughs and tarns including coastal sea loughs. The give-away clue to this species is the glaucous thallus developed over a white prothallus. Discs are beige or pink. Furthermore, when sterile, the species has distinctive white-pubescent pycnidia and a UV + pink thallus. Where it occurs, it is frequently accompanied by B. trachona. In Ireland, present in Counties Kerry and Galway; also north coast.

Key Identification Features:

• Glaucous-green, felt-like thallus developed over a white prothallus
• Sterile material has white, furry pycnidia and a UV+ pink thallus.

Original text submitted by Vince J. Giavarini

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

iNaturalist: Aquacidia antricola at iNaturalist World Species Observations database.