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Cell Wall Ingrowths of Nonhaustorial Hyphae of Peronospora trifoliorum. T. J. Martin, Former Graduate Research Assistant, Department of Plant Pathology, Kansas State University, Manhattan 66506; D. L. Stuteville, Associate Professor, Department of Plant Pathology, Kansas State University, Manhattan 66506. Phytopathology 65:638-639. DOI: 10.1094/Phyto-65-638.

The cell wall of Peronospora trifoliorum mycelium in Medicago sativa leaves has finger-like projections extending as deep as 1 µm into the fungal cytoplasm. The fungal plasma membrane follows the contours of these wall ingrowths and its surface area thereby is increased considerably.