Ultrastructure of the appressorium of Spilocaea pomi

Abstract
The appressorium, seen after penetration of the apple [Malus] leaf cuticle, has a 2-layered wall, an electron-dense outer layer, and an electron-transparent inner layer. The pore of the appressorium is bordered by the electron-dense outer layer, which tapers at the margin of the pore. The penetration hypha is derived from the infection sac, a structure or organelle within the appressorium.

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