Family: Lecanoraceae Species: Myriolecis sambuci (Lecanora sambuci) Growth type crustose Photos: Kilcolman, Co. Limerick, Ireland. White or greyish-white thallus, minutely granular or continuous without a conspicuous prothallus. Small apothecia are clustered or dispersed, greyish-brown to pinkish-brown with entire or slightly crenulate margins that become +/- excluded. Asci contain (8-)16-32 spores, spores simple, (6-)8-12 x 4-6(-7) µm. Pycnidia frequent. Margins contain small crystals inside the upper, outer edges (visible under polarised light). Epithecium occasionally has a few superficial granules. Micrographs below. Chemical results negative. Local distribution on nutrient-enriched bark, often in twig axils of Fraxinus, Populus tremula and Sambucus. Similar: Myriolecis hagenii and M. persimilis. Asci 8-spored, crystals and granules absent. Lecania cyrtella, 1-septate spores

Micrographs





Myriolecis sambuci (Lecanora sambuci). Auust 2024