Description: G. truncigena is the commonest of three species in this family that inhabit the nutrient-rich rain tracks of basic-barked trees. The thin, minutely granular creamy-grey thallus can be packed with vary small (to 0.5mm diam.) orange to pale pink discs with a plump, smooth margin (like a tiny wheel tyre). Under the microscope the spores are colourless and muriform (like the divisions of a stained-glass window) with between 6 and 12 cells. Local. Throughout Ireland.

Key Identification Features:

• Tiny, orange to pale-pink coloured fruit gum-like discs on the rain tracks of ash and elm and other basic-barked trees
• Muriform spores with 6-12 cells [G. flotowii has two to five cells while the darker-fruited G. derivata has septate-spores only].

Original text submitted by Vince J. Giavarini

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

iNaturalist: Gyalecta truncigena at iNaturalist World Species Observations database.