Order: Incertae sedis       Family: Arthopyreniaceae Species: Arthopyrenia punctiformis Growth type crustose Photos: On Horse-chestnut twig. Ardsallagh, Co. Waterford, Ireland The inconspicuous, non-lichenised thallus has small, +/- circular, clustered or scattered perithecia. Pycnidia are absent. Spores are initially colourless, 1-septate, 16-20(-22) x 4.5-5 µm. Microscope photograph below. Common as an early coloniser on smooth twigs and small branches of young trees and shrubs.

Microscope photograph

Arthopyrenia punctiformis. April 2012