Order: Lecanorales       Family: Lecanoraceae Species: Lecanora pulicaris Growth type crustose Photos: On wooden seat. Kilcolman, Co. Limerick, Ireland Smooth or warted yellow-white or greyish thallus, with or without a white or greyish prothallus. Discs red-brown or dark brown, medulla with large crystals (not dissolving in K) and small granules (dissolving in K) on surface of epithecium. Spores 11-15 x 8-10 µm. Microscope photograph below. On acid-barked twigs and branches and wooden posts and fences. K+ yellow, C-, KC-, P+ orange-red, UV- or bluish-white Similar: Lecanora chlarotera. P-. Larger granules on epithecium

Microscope photograph

Lecaonora pulicaris. March 2010 and September 2019