Pseudotrichia viburnicola  

Anamorph: not known.
Teleomorph: ascostromata perithecial, 300-400 µm diam. and 300-450 µm high, scattered or in clusters of up to ca 30, immersed within the host cortical tissues but associated with degraded stromata of another fungus and presumably either parasitic or a secondary colonizer. Basal part ± conical to conic-globose with a ± flat black base [possibly derived from stromatic tissues of the host fungus] and ± hyaline lateral walls, and a strongly papillate neck to ca 200 µm tall and 150-180 µm diam. surrounded by conspicuous yellow-orange ectostromatic tissue that stains bright crimson in KOH. Peridium 30-40 µm thick, consisting of several layers of ± hyaline to pale brown cells. Interascal tissue composed of copious trabeculate pseudoparaphyses ca 1 µm diam. that tend to degrade at maturity, the ostiole lined with periphyses. Asci 120-160 x 22-30 µm, clavate with a long tapering stalk, the apex rounded, thick-walled and fissitunicate with a clear ocular chamber, 8-spored. Ascospores biseriately arranged, (56-) 63-72 x 9-12 µm, fusiform, the apex and base ± acute, straight or somewhat inaequilateral, usually 7-septate, modestly constricted at the ± median primary septum, the cell above the primary septum slightly inflated; eventually pale yellow-brown, smooth or minutely roughened, with a narrow gelatinous sheath.