Order: Lecanorales       Family: Candelariaceae Species: Candelariella medians Growth type placodioid (crustose with lobed margins) Photos: On church wall. Macroom, Cork, SW Ireland. Placodioid yellow lichen with a yellow or greyish-yellow areolate centre and flattened pruinose lobes. Colour is greyer in shaded situations. Brownish-yellow apothecia with smooth or crenulate margins and simple spores. Can form large patches. Chemical reactions: K- (Caloplaca species are K+ red) Usually found on man-made substrates, cement, concrete, gravestones. Less frequent on hard calcareous rocks.

     


Candelariella medians. Macroom, Co.Cork. December 2008