Order: Lecanorales       Family: Lecanoraceae Species: Lecidella elaeochroma f. elaeochroma Growth type crustose. Photos: On Ash and Sycamore. Ballingeary, Cork, SW Ireland. Variable. Smooth or slightly granular, light-grey to yellowish-grey thallus surrounded by black prothallus. Often forms large mosaics. Apothecia with black discs, initially concave then convex with broad margins that become excluded. Discs reddish or piebald in shade. L. elaeochroma f. soralifera has greenish-yellow soralia. A pioneer species, common on smooth-barked trees and fences. K+ yellow, C+ orange (usually), KC+ yellow, P-, UV+ orange. Reactions can be faint. Similar: Amandinea punctata. Chemical reactions negative. Buellia disciformis. K+ bright yellow, C-

Lecidella elaeochroma April and December 2009, January 2010