Order: Lecanorales       Family: Lecanoraceae Species: Lecidella elaeochroma f. elaeochroma Growth type crustose. Photos: On Ash and Sycamore. SW Ireland Very 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. Ascus 8-spored, spores simple, thick-walled, 10-17 x 6-9 µm. Microscope photos below. 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 but reactions can be faint. K/UV (wet)+ bright yellow-green Similar: Amandinea punctata. Chemical reactions negative. Buellia disciformis. K+ bright yellow, C-. Spores 1-septate

Microscope photographs



Lecidella elaeochroma April and December 2009, January 2010