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General Description

 Colonies. Growth in YM broth: after 3 days at 25°C, the cells are spheroidal to short-ovoidal, (2-7.2) × (2.2-8.6) μm, and single, in pairs or in short chains. A sediment, a ring and, in some strains, a smooth or wrinkled, dry pellicle or islets are formed. Growth on YM agar: after one month at 17 C, the streak culture is grayish-white to yellowish, soft, shiny or dull, smooth or partly or entirely striped or wrinkled. Dalmau plate culture on corn meal agar: pseudomycelium is usually lacking, but occasionally a primitive, or even a well-developed pseudomycelium is formed. Teleomorph. Formation of ascospores: conjugation between a cell and its bud precedes ascus formation; conjugation between separate cells may also occur. The spores are spheroidal with a warty wall. The wartiness is not always distinct under the light microscope. With the scanning electron microscope, warts appear as small blunt protuberances or as small ridges. Usually one, seldom two spores are formed per ascus. The presence of many spores gives the culture a brown colour. Ascospores were observed on V8, Gorodkowa, acetate and YM agars after 1-2 weeks at or below 20°C. 


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© Ahmed Abdel-Azeem

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