Description: Like C. cristatum (described elsewhere), which has an abundance of narrow, concave lobes and numerous discs but differs in its less incised lobes and predominance of wart-like projections in the centre (isidia). North and north-west Ireland.

Key Identification Features:

• Sometimes with numerous globose isidia centrally
• Less deeply-cut, unwrinkled lobes.

Original text submitted by Vince J. Giavarini

Distribution Map from NBN: Lathagrium cristatum var. marginale at National Biodiversity Network mapping facility, data for UK.

iNaturalist: Lathagrium cristatum var. marginale at iNaturalist World Species Observations database.