Aspicilia calcarea


Thallus a chalky white (to pale blue-grey), smooth to cracked-areolate crust, margin well-defined, usually with radial cracking; apothecia set in the thallus, with black discs, or initially grey-pruinose, one or more per areole. Often forming conspicuous, large, circular patches.

Identification difficulty
Recording advice

Unless identified by a recognised expert, a photo is required and the specimen should be examined with a microscope. In the comments box, state the key or ID method used and describe the size and identifying characters.


On hard limestone

When to see it

All year round.

UK Status

Widespread and quite frequent in Britain becoming less common in Scotland.

VC55 Status

Widespread and fairly frequent in Leicestershire and Rutland.

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Leicestershire & Rutland Map


Yellow squares = NBN records (all known data)
Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015

UK Map