Amphiporthe  

Anamorph: Amphicytostroma. Conidiomata as locules within the perithecial stroma, often towards the periphery. Conidiophores filiform, hyaline, septate, smooth, irregularly branched, formed in the basal part of the locules. Conidiogenous cells cylindrical, hyaline, smooth, with a minute channel and collarette, enteroblastic, phialidic, integrated, determinate. Conidia cylindrical to ellipsoidal, straight or slightly curved, hyaline, simple, smooth.

Teleomorph: Stroma appearing as scattered, ± circular, low or truncate-conical pustules, erumpent through host bark; exposing a well-developed black-brown to greyish ectostromatic disc through which the perithecial necks emerge, darkened area somewhat extended beneath the host bark; entostroma well-developed, brownish, composed of hyphae and rounded-angular cells intermixed with host cells and angular crystals, sometimes poorly developed beneath the perithecia, containing a cluster of perithecia in the lower part, lacking any distinct zone lines within the substrate. Ascomata perithecia, globose or mutually deformed, with long necks, black, upright to oblique; necks convergent or remaining separate, with just the upper part emergent; formed in clusters in the lower part of the entostroma. Peridium composed of brown, thick-walled, rounded-angular cells at the exterior, merging into an interior layer of compressed, hyaline cells, neck composed of elongate, brown, thick-walled cells. Interascal tissue composed of paraphyses, broad, ribbon-like at first but soon disappearing, the neck periphysate. Asci clavate to cylindrical-clavate, the apex somewhat truncate, thick-walled particularly in the upper half, with a single discernable wall, 8-spored, J-, with a refractive apical ring, becoming detached within the perithecial cavity. Ascospores narrowly ellipsoid to near fusiform, often tapering slightly more at one end than the other, straight to slightly curved, hyaline, 1-septate, the septum usually median but sometimes dividing the spore nearly 2:1, slightly constricted at the septum, smooth, sometimes with a small hyaline appendage at each end.