Family: Lecanoraceae Species: Myriolecis crenulata (Lecanora crenulata) Growth type crustose Photos: Kilcolman, Co. Limerick, Ireland. The pale grey, smooth or slightly granular thallus usually immersed, apothecia often in small groups. Discs whitish or greyish pruinose with well-developed, persistent, deep and regularly crenate margins. Occurs on hard limestone rocks, calcareous monuments, walls and mortar. Chemical results and UV negative Member of the Myriolecis dispersa (Lecanora dispersa) group. Similar: M. antiqua (L. antiqua), pruinose apothecia C+ orange.

Myriolecis crenulata (Lecanora crenulata). June 2025