Description: This is a species of woodland and parkland rather than waysides and does best away from the direct effects of dust, salt and nitrogen deposition. Unlike its relatives, the medulla of this species tests negative with a drop of fresh bleach (C). The grey, leafy thallus is grizzled with soredia (produced from white spots of pseudocyphellae) which are gritty and coarse. Sometimes folioles (leafy scales) are present. The black lower surface of the lobes distinguishes it further from P. subrudecta which is the only lookalike to share its habitat. Throughout Ireland.

Key Identification Features:

• Medulla C-, soralia producing gritty, crumbly soredia
• Undersurface of the lobes black with paler edge.

Original text submitted by Vince J. Giavarini

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

iNaturalist: Punctelia reddenda at iNaturalist World Species Observations database.