Description: This ‘dog lichen’ occurs on mature, mossy trees and rocks in relatively undisturbed old growth and oceanic woodland. The grey-blue slightly frosted thallus has its rather convoluted and ragged lobe edges lined with similarly coloured soredia. The lower surface has pale brown veins. It occurs in suitable habitat, particularly towards the south-west of Ireland.

Key Identification Features:

• The grey-blue, foliose thallus of this ‘dog lichen’ with soredia restricted to the margins only, confirms it
• Sticta limbata is similar but with an underside perforated, not veined, and with soredia spreading onto the thallus from the edges. Nephroma parile is glossy brown with soredia spotted across the lobes; it also lacks veins on the underside.

Original text submitted by Simon Davey

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

iNaturalist: Peltigera collina at iNaturalist World Species Observations database.