Description: First read the description for Candelariella vitellina f. vitellina elsewhere on this web site. C. aurella differs in its thallus of scattered, mustard-yellow granules on a black prothallus. C. aurella is well adapted to urban settings and will grow well on garden walls in large towns and cities that are constructed from calcareous rock or brick. It has a K negative reaction.

Key Identification Features:

• The black prothallus may be the dominant part of the thallus, especially in urban areas. Over this area, small yellow granules and discs are scattered. The similar Candelariella vitellina always has a better developed, granular yellow thallus
• On urban walls mostly.

Original text submitted by Simon Davey

Distribution Map from NBN: Candelariella aurella f. aurella at National Biodiversity Network mapping facility, data for UK.

iNaturalist: Candelariella aurella f. aurella at iNaturalist World Species Observations database.