Ginanniella primulae (Rostrup) Ciferri, 1938 Urocystis primulae is a fungal plant pathogen that infects several species of Primula.

[1] The fungus affects the flowers of the plant, turning the contents of the ovary into a mass of spore balls: clumps of ustilospores wrapped in a layer of sterile cells.

[1] It also produces white, powdery conidia in the anthers.

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