Roccellaceae Pseudoschismatomma rufescens (Opegrapha rufescens) Growth type crustose Chemical results negative. Scattered distribution on shaded, nutrient-rich, basic-barked trees Greenish or red-brown thallus, sometimes with dark prothallus. Apothecia are curved or +/- stellate, usually numerous with discs fully exposed, surrounded by thin excple and distinctive raised whitish pseudothalline exciple. Spores 3-septate, (15-)17-27 x 3-5 µm, often curved. Photobiont Trentepohlia. Microscope photographs below. Similar: Schismatomma graphidiodes.

Microscope photographs



Opegrapha rufescens
Holton Lee and Badbury Rings, Dorset. Dorset. 2012 and March 2016