Dialonectria diatrypicola  

Anamorph: Fusarium-like. Presumed anamorph on host material with copiously branched conidiophores producing clusters of ± cylindrical, gradually tapering conidiogenous cells 9-18 x 1.5-2 µm, proliferating percurrently with visible periclinal thickening and small collarettes, sometimes to form new conidiogenous cells. Conidia 3.5-4 x 1-1.5 µm, ellipsoidal to bacillar, sometimes slightly curved, aseptate, hyaline, thin-walled. In culture, colonies slimy, with yellow to pale orange sporodochia. Macroconidia 14–35 × 3–4 μm, slightly curved with a pedicellate foot-cell, 0- to 3-septate, smooth-walled. Microconidia 4.5–7 (–9) × 2–3 μm, aseptate, narrowly ellipsoidal to subcylindrical, hyaline, smooth-walled.
Teleomorph: ascomata perithecia, 250-280 µm diam. and 270-320 µm high, superficial, seated on a minute pseudoparenchymatous basal stroma, in groups of 2–10 (–15), widely obpyriform to subglobose, collapsing laterally or not collapsing when dry, orange when immature, becoming bright red when mature, turning dark purple in KOH, yellow in lactic acid, with a darker ostiolar region 40–50 μm high × 120–140 μm diam. Peridium of globose to ellipsoidal, angular cells to 16 μm in greatest dimension, smooth but sometimes appearing finely roughened due to a network of pale orange hyphae partially covering some ascomata. Interasacal tissue of evanescent moniliform paraphyses, to 10 μm diam. at the base. Asci 75–90 × 6.5–8 μm, cylindrical, short–stalked, thin-walled, the apex obtuse to rounded with an inconspicuous faintly refractive ring, 8-spored. Ascospores (10.5–) 11.5–13 (–14) × 6–6.5 (-7) μm, ellipsoidal, slightly constricted at the ± median septum, pale brownish–yellow when mature, with conspicuous low domed warts.