Trypetheliaceae (Arthopyreniaceae) Alloarthopyrenia italica (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



Alloarthopyrenia italica (Arthopyrenia cinereopruinosa)
On Viburnum. Portland, Dorset. February 2016