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General Description

 Colonies. On Potato Sucrose Agar (PSA) plates after 4 days growth rate from 5-5.65 cm diam., with aerial mycelium floccose, white to golden yellow. For all isolates pigmentation was light brown. On Potato Dextrose Agar (PDA) after 10 days growth rate from 7.5-8.15 cm length, with aerial mycelium abundant, dense, white with brownish yellow and pigmentation brown. "Chlamydospores" sparse, intercalary or terminal in hyphae, in chains and in clusters and smooth walled; also found in cells of macroconidia. Able to grow on Glycerol Nitrate Agar (G25N) medium with growth not exceeding 2 cm diam., producing white or yellowish white aerial mycelium and yellow or orange yellow pigmentation. On mannitol sucrose medium growth exceeding 4 cm diam., producing yellowish or orange white aerial mycelium and orange or dark yellow pigmentation. Producing urease, phosphatase and peroxidase enzymes. No growth on tannin-sucrose agar and acid on creatine sucrose agar, acetylmethylcarbinol compound and pyrocatechol oxidase enzyme not produced. Conidiomata. Sporodochial, light orange, common. Conidia. "Macroconidia" curved, fusoid, lanceolate, 3- to 5-septate, 30-55 × 4-5.5 μm with pointed apical cell and foot-shaped basal cell. "Microconidia" very rare, if present oval, 0-1 septate, produced singly or in small false heads on conidiogenous cells with only one active fertile site. Stromata. On dead or fallen wood, small, scattered, forming in the cortex below the periderm and bursting through the overlying layers, composed of pure fungal tissue made up of thin-walled globose to hexagonal pseudoparenchymatous cells; one to seven ascomata developing on the surface cushion of each stroma. Ascomata. Perithecial, scattered to crowded, 180-220 μm diam., obpyriform to almost globose when moist but sometimes undergoing a lateral collapse on drying; the outer stromatic part of the wall composed of 3-5 layers of oval to globose cells with somewhat thicker walls than the cells of the underlying stroma; cell wall with a deep violet pigment which dissolves in lactic acid; several layers of very thin-walled lanceolate cells (which comprise the true ascomatal wall) present within these stromatic cell layers; these layers together with the interascal tissue tending to disintegrate as asci mature. Asci. 6- to 8-spored, 70-110 × 11-16 μm, clavate, with a thin wall slightly thickened at the rounded apex. Ascospores. 3-septate, fusiform to ellipsoid, curved and slightly narrower at the septa; 20-28 × 6-9 μm, sometimes larger (26-34 × 8-10 μm) in collections from hardwood trees such as Quercus and Ulmus (ascospores isolated from these have produced Fusarium sambucinum-like cultures which are not morphologically distinct from those obtained from the smaller-spored forms). 

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© Ahmed Abdel-Azeem

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