Family: Trypetheliaceae Species: Arthopyrenia salicis Growth type crustose. Identified by Brian Coppins and J Douglass Photos: On Ash and Sycamore. Co. Cork, SW Ireland. Thallus +/- inconspicuous, pale to darker brown, sometimes pinkish when fresh. Not always lichenised, the Trentepholia cells in the thalli can be abundant or undetectable. Small pimple-like perithecia, the ostiole (pore-like opening) often +/- sunken. Spores colourless, 1-septate, 14-17 x 4-5.5 µm. Cells constricted at septum, lower cell often with a median constriction. Micro photos below. Chemical reactions negative. Widespread throughout Ireland on smooth bark, especially Hazel. Similar: Arthopyrenia punctiformis and A. nitescens Mycomicrothelia confusa has brown spores.

Microscope photographs



Arthopyrenia salicis January 2010 and 2012