Arthopyreniaceae Arthopyrenia cinereopruinosa Growth type crustose Chemical results negative. Found on smooth bark, especially of young Hazel and Ash Inconspicuous thallus, the small circular or ellipsoid perithecia often covered by a thin layer of bark cells. Spores 1-septate, 15-22 x 5-8 µm, constricted at septum, both cells medially constricted and with a distinct perispore. Microscope photographs below. Similar: A. analepta. Larger perithecia, spores without median contrictions

Microscope photographs



Arthopyrenia cinereopruinosa
On Viburnum. Portland, Dorset. February 2016