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General Description

 Colonies. Growth in 5% malt extract: after 3 days at 25°C, cells globose, ellipsoid or cylindroid, 3.0-5.0 × 5.0-24.0 μm, single, in pairs or small groups; after one month at 20°C, sediment present, sometimes also a thin ring. Growth on 5% malt agar: after one month at 20°C, streak culture is brownish, dull or glistening, slightly raised, striated; margin entire or sinuous. Growth on surface of assimilation media: pellicles not formed. Dalmau plate culture on morphology agar: after 5 days at 25°C, a few short chains of cells sometimes observed. Teleomorph. Ascospores may be present. Formation of ascospores: conjugation of vegetative cells precedes formation of evanescent asci containing two to four globose to ellipsoidal ascospores. Ascospores may cohere in small groups upon release. Haploid heterothallic strains may be encountered. When observed by SEM, the ascospore surface is warty. Sporulation was observed on malt-, potato- and corn meal agars after 5-6 days at 25°C. 

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© Ahmed Abdel-Azeem

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