Parmelia saxatilis - Parmelia saxatilis sensu lato


Thallus foliose, pale grey, sometimes green-grey in shade, becoming brown at drying lobe tips. Conspicuous, white pseudocyphellae are found on the lobe surfaces. Older parts of the thallus become densely isidiate, the isidia shining, or often pruinose, arising initially from the network formed by the pseudocyphellae. Was once used to produce a reddish-brown dye.

Identification difficulty

Usually on base-poor rocks, but also on acid-barked trees and other trees where the bark has been acidified by atmospheric pollution.

When to see it

All year.

UK Status


VC55 Status

Not known.

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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