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Images of British Lichens

Lecanora aitema (Ach.) Hepp

Thallus often in small patches, cream-white, granular to cracked-areolate; apothecia clustered, becoming convex, with thick margins that become turned under, discs pale brown becoming dark red-brown or blackish; on acidic bark, twigs and old, worked wood, widespread but predominantly in the north and west.

Refs: Smith et al. (2009), 475; Purvis et al. (1992), 298; Dobson (2011), 218 (photo); van Herk & Aptroot (2004, 2013), 200-201 (photo).

Sometimes parasitised by Phaeosporobolus alpinus, which further blackens the apothecia (see below).

Lecanora aitema
On old, worked wood, Braemar, Aberdeenshire, March 2008
Lecanora aitema parasitised by Phaeosporobolus alpinus
On ancient, wooden bridge, Mar Estate, Aberdeenshire, parasitised by Phaeosporobolus alpinus, April 2008

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© A.J. Silverside
Uploaded May 2011, last updated December 2013