General Description

 On Potato Sucrose Agar (PSA). Colonies. After 4 days growth of isolates ranges from 4.5-6.35 cm diam. with a mean ñ SD = 4.09 ñ 0.52; mycelium delicate white with purplish pink or grayish magenta or white with a purple pigmentation. On Potato Dextrose Agar (PDA). Colonies. After 10 days growth on slants ranges from 7-8.25 cm length with a mean ñ SD = 7.05 ñ 0.43; mycelium sparse or abundant ranging in colour from white to pale violet or violet white; small pale brown, blue or violet sclerotia sometimes produced abundantly; mycelium producing terminal or intercalary, smooth or rough walled "chlamydospores" abundantly and quickly, usually singly, in pairs, in clusters or in short chains. Conidia. Of two types; macroconidia sparse in some strains, but usually abundant in sporodochia, straight to slightly curved, thin walled, 27-60 × 3-5 μm, usually 3- to 5-septate, 3-septate being most common, each with a tapering and curved apical cell and foot shaped basal cell; microconidia abundant, oval, elliptical, straight to curved, usually 0-septate, 5-12 × 2-3.5 μ, produced in false heads on short monophialidic conidiogenous cells. Teleomorph. Not known. Notes. This species usually produces pale violet (Potato Dextrose Agar) or magenta (Potato Dextrose Agar) pigmentation; it grows on Glycerol Nitrate Agar (G25N) with white or pale yellow aerial mycelium and yellow pigmentation; growth on mannitol sucrose medium results in white or reddish white or red aerial mycelium and red or brownish red or grayish red pigmentation; growth on Czapek-Dox Iprodione Dichloran Agar (CZID) results in white or pinkish white or pink aerial mycelium and brownish grey or purplish grey pigmentation. The species produces urease and phosphatase enzymes, but does not produce acid on creatine sucrose agar and acetylmethylcarbinol compound. Different isolates vary in production of peroxidase and pyrocatechol oxidase enzymes.