Description: Among the smallest of all the Irish lichens, C. atamarioides is a miniaturised version of C. chalybeia var. chalybeia. Because of its size, it can occur widely on all manner of siliceous rock fragments, especially along the edges of moors and heaths as well as slate and brick. It can be distinguished by the tiny black discs (0.1-0.2mm diam.) and colourless hypothecium. In Ireland, the species is thinly scattered.

Key Identification Features:

• Like scaled-down C. chalybeia var. chalybeia, but with smaller discs and colourless hypothecium
• On stones of acid rock, shingle, slate, etc.

Original text submitted by Vince J. Giavarini

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

iNaturalist: Catillaria atomarioides at iNaturalist World Species Observations database.