Description: Look for this lichen on all varieties of calcareous substrata as it is common in our towns and cities. Often the thallus is just a few scattered grey-white granules. Yet these are always dominated by scores of tiny white-rimmed discs with yellow-brown centres that can be pinker or darker depending on the substrate. On purer limestones the discs are pruinose, while on walls subjected to dust or air pollution, the discs may be dirty and greyer.

Key Identification Features:

• On most calcareous substrata, thallus of barely visible scattered granules but the white-rimmed discs (on average c. 0.2–1mm diam.) abundant, often crowded with yellow, pink or brown centres
• A very pollution-tolerant species of walls, patios, pavements, ecclesiastical buildings.

Original text submitted by Vince J. Giavarini

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

iNaturalist: Myriolecis dispersa at iNaturalist World Species Observations database.