Irish lichens
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Order: Arthoniales Family: Arthoniaceae
Species: Arthonia didyma Photos: Dromore, Co. Cork, SW Ireland. Immmersed thallus with small, flat, brown or black apothecia. Spores are 1-septate, 14-17 x 4.5-7 µm, colourless becoming brown. Pycnidia rare. Microscope photograph below. Chemical results: Red-brown pigment K+ grey or olive. Epithecium, hymenium and sometimes the hypothecium with orange-red K+ purple-violet pigment Found on the smooth bark of shrubs and trees (usually Corylus) in unpolluted woodlands |
