Family: Lecanographaceae Species: Alyxoria ochrocheila (Opegrapha ochrocheila) Growth type crustose Photos: Kilcolman, Co. Limerick, Ireland. Thin or immersed whitish-grey thallus, sometimes tinged brownish or olive-green. Lirellae with open discs, the margins and sometimes also the discs usually with reddish-orange pruina. Spores 3-septate, (12)14-16(-22) × 3-4.5(5) µm, perispore absent. Second cell is broadest but similar length to the other cells. Micrographs below. Orange pruina K+ red-purple. Exciple K+ olive-green, brown to reddish in section. N.B. Forms with non-pruinose apothecia occur Can be locally frequent on dry, shaded deciduous bark in mature woodland, particularly on Oak. Rare on sheltered siliceous rocks. Similar: Alyxoria culmigena (Opegrapha herbarum). The second cell is usually longer and broader than the other cells

Micrographs



Alyxoria ochrocheila (Opegrapha ochrocheila). August 2024