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Aspicilia caesiocinerea (Nyl. ex Malbr.) Arnold
 
(= Circinaria caesiocinerea (Nyl. ex Malbr.) A.Nordin, S.Savić & Tibell)


Thallus a warted, blueish- or brownish-grey crust; apothecia more or less immersed, with thick, thalline margins and black, sunken discs. Widespread and locally frequent on base-poor rocks. Distinguished from members of the A. cinerea group by chemical tests (Pd-, K-).

Refs: Smith et al. (2009), 183; Purvis et al. (1992), 98; Dobson (2005), 72-3 (photo); Dobson (2011), 79 (photo); van Herk & Aptroot (2004, 2013), 64-5 (photo); Moberg & Holmåson (1984), 111 (photo, upper left); Hansen & Anderson (1995), 77 (photo); Valcárcel et al. (2003), 120-1 (photo); Wirth, Hauck & Schulz (2013), 1: 190-1, 367 (photo, as Circinaria caesiocinerea); Thomson (1997), 63, 65 (photo).

Sometimes parasitised by Rhizocarpon viridiatrum.

FGBI: http://fungi.myspecies.info/all-fungi/circinaria-caesiocinerea

 
Aspicilia caesiocinerea
On siliceous rock, Glen Tilt, Perthshire, April 2008


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Uploaded October 2009, page last updated January 2016