Description: The thallus of this species forms an effuse green-white granular crust over open soil, grassy turf and rocky areas near bird colonies, and is very similar in appearance to Bilimbia sabuletorum (described elsewhere). It is a specialist of nutrient-rich sites. The pink to grey-black discs with spores three- to five-septate are crowded into clusters. Pale forms growing on calcareous rock are distinguished from Lecania cuprea (described elsewhere) by the coloured and more swollen ends of the paraphyses. In Ireland the species is known from Counties Clare and Sligo; it was on grassy turf over sand dunes at this last site.

Key Identification Features:

• Green-granular crustose lichen of nutrient-rich rocks, bird-lime, turf or soil.
• Discs black, pinker in the shade, 0.2-0.6mm diam., crowded; easily overlooked for Bilimbia sabuletorum which has larger, three- to seven-septate spore.

Original text submitted by Vince J. Giavarini

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

iNaturalist: Bacidina subfuscula at iNaturalist World Species Observations database.