From APS Press and CMI description #340:
Pycnidia are freely formed on many media, and may be embedded in the medium, or distributed on the surface. They are globose and brown or black, and open by papillate ostioles. The conidiophore, conidia, or pycnidiospores are (3-6.5 x 8-16 μm, average 4.5 x 12.3 um) hyaline, typically with one septum (some 2 or 3) that has a slight to prominent constriction, and ellipsoid. Profuse dark brown or olive-coloured chlamydospores are mainly intercalary and in chains. Colonies are light to dark grey, often growing with concentric rings. The principle characteristic differentiating the three Asochyta spp. is the presence of perithecia in D. pinodes. The conidia of D. pinodella are distinctly smaller and more spherical than those of A. pisi. The conidial dimensions of D. pinodes and D. pinodella overlap; however the absence of septa in a large portion of D. pinodella is also a distinguishing feature.
