Partly dead leaves of "Wisteria frutescens" have been found to host "Phomatospora wistariae" Ellis & Everh. This fungus is perithecial, meaning its fruiting body is flask-shaped with an ostiole through which its ascospores are released. It is mostly epiphytic, and it grows in relatively flat gray spots that are approximately 2–4 mm. in diameter. These spots are bounded by narrow dark lines; however, they frequently run together. "Phomatospora wistariae" is hyaline in appearance and resembles a membrane, it is sessile, it does not have paraphyses, its asci are oblong, and its sporidia are biseriate and have an oblong-elliptical shape. Its perithecia mesaure to about 110-120 μm, its asci 35-45 by 10-12 μm, and its sporidia 12 by 6 μm.