Woronin bodies in Erysiphe graminis DC.

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Abstract
Woronin bodies within 0.3 μ, of the septa are present near all septal pores in Erysiphe graminis cells and regulate cytoplasmic flow not only in injured but also in actively growing healthy colonies. Some mechanism holds them in place. They vary in size, 0.2 μ, – 0.4 μ, and frequently the central one plugs the septal pores, which are less than 0.15 μ, in actively developing colonies. When a Woronin body is in a septal pore a sac often occurs adjacent to the Woronin body in the adjoining cell which is less dense. The septa are thinner in the Woronin-body region. Woronin bodies are distinct from lysosomes because they are not destroyed in potassium permanganate fixatives and because they do not occur throughout the cell. They differ from lipid bodies because they are destroyed by pepsin and are not removed by acetone.

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