Longitudinal section through an ascoma of Dothidotthia symphoricarpi.
Image Credit: Pedro Crous.

Dothidotthia symphoricarpi was isolated from branches of Symphoricarpos occidentalis. The Ascomata are in gregarious clusters, rarely solitary, erumpent, up to 550 µm diam and 500 µm high; apex somewhat papillate to depressed; wall consisting of 3–6 layers of dark brown textura angularis, 20–80 µm wide, giving rise to dark brown, thick-walled hyphae, 4–6 µm wide, that extend from the bottom of the ascomata into the substrate; reduced to short lateral projections (10–15 µm long) elsewhere on the outer ascomatal wall. Pseudoparaphyses hyaline, septate, 2–3 µm wide, generally not constricted at septa, and branched in upper part above asci. Asci 8-spored, bitunicate, sessile, clavate, 70–120 x 15–22 µm, straight to curved. Ascospores uniformly pale brown, ellipsoid, tapering towards subacutely rounded ends, medianly 1-septate, prominently constricted at septum, widest just above septum, smooth.