Candelariella medians Candelariaceae
Candelariella medians

Growth type crustose, placodioid
Chemical reactions: K- (Caloplaca species are K+ red)

Usually occurs on man-made substrates; cement, concrete and gravestones. Less frequent on hard calcareous rocks.

Yellow or greyish-yellow thallus with flattened, pruinose lobes, the centre areolate, +/- granular isidiate. Brownish-yellow apothecia rare, with smooth or crenulate margins and simple spores. Can form large patches, the colour greyer in shaded situations.

Similar: Caloplaca decipiens is K+ red

Candelariella medians
Wareham and Sturminster Marshall, Dorset. August 2012, March 2014

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