Sclerotinia minor

The sclerotia (survival structures) have a black outer rind, are irregularly shaped, and are approximately (0.5-3.0mm) in size.  Apothecia are rarely seen in the natural environment, but may occur during February and March or mid-fall on the soil surface.  The apothecia are pale orange to white and have concave or flat tops. If apothecia do form, they may be 6 mm or more in diameter and contain asci with ascospores (sexual spores) that measure 8-17 x 5-7 um.  The main mode of infection of S. minor is through eruptive germination of the sclerotia, giving rise to mycelium that infects the plant tissue.

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