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Verrucaria caerulea DC.
Thallus minutely cracked-areolate, usually blue-grey, prothallus dark brown, commonly forming a delimited margin to the colony; perithecia small, numerous, projecting little above the surfaces of the areoles. Widespread but local on hard limestones.
Refs: Smith et al. (2009), 943; Purvis et al. (1992), 635; Dobson (2005), 454 (photo).
On limestone rocks, Schiehallion, Perthshire, April 2003
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Uploaded September 2008, last modified June 2010
