Order: Pertusariales       Family: Pertusariaceae Species: Pertusaria pertusa Growth type crustose. Photos: Gougane Barra, Cork, SW Ireland. Thick, slightly cracked greenish-grey thallus, often with conspicuous zoned margin. 3-7 apothecia produced from each wart-like protuberance. Asci usually 2-spored, spores (120-)145-230(-330) x 40-90 µm. Spore wall 7-15 µm thick. Microscope photos below. K+ yellow, C-, KC+ yellow or yellow-orange, P+ deep orange, UV+/- pale orange. Common on tree bark, occasionally found on rocks. Similar: Pertusaria hymenea. Discs +/- open. K-, C+ yellow

Microscope photographs



Pertusaria pertusa . August 2009, February 2012