Apiognomonia veneta  

Ascomata hypogenous, perithecial, 170-250 µm diam, oblate to globose, scattered, the body immersed, often collapsing into a cupulate structure when dry, black. Neck straight, 90-170 µm tall and 40-50 µm diam, paler at the apex. Peridium 15-20 µm thick, with 4-5 layers of cells. Asci 42-57 x 7.5-11 µm, clavate, the spores fasciculate, with an apical ring 3.5-5 µm diam. Ascospores 13.5-15 x 3-4.5 µm, septum dividing the spore 5:1, fusiform, inaequilateral, not noticeably constricted at the septum, the larger upper cell usually 2-guttulate, without a gelatinous sheath or appendages.

Anamorph acervular, the conidiomata 80-300 µm diam, intraepidermal, on the lower surface of leaves. Conidiophores 30-50 µm in length, densely branched. Conidiogenous cells 12-16 x 3.5-5 µm, lageniform to cylindrical, proliferating percurrently and sometimes annelidic. Conidia 10.5-12.5 x 5-6 µm, widely ellipsoidal to ovoid, often inaequilateral or allantoid, length 2-3 times the width, simple, hyaline.