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Intracellular Occurrence of Bacteria in Mummy-Diseased Mushrooms. Annemarie van Zaayen, Institute of Phytopathological Research (IPO), Wageningen, The Netherlands, Present address of senior author: Mushroom Experimental Station, Horst 5640, The Netherlands; H. A. J. I. Waterreus, Institute of Phytopathological Research (IPO), Wageningen, The Netherlands. Phytopathology 64:1474-1475. DOI: 10.1094/Phyto-64-1474.

Rod-shaped bacteria were observed in ultrathin sections of stipe cells of Agaricus bisporus sporophores affected by mummy disease. From one up to twelve bacteria per intact mushroom cell were found in only a few cells per section. No bacteria were detected in cells of healthy mushroom sporocarps. The constant association and intracellular nature of bacteria with sporocarp tissue of cultivated mushrooms affected by mummy disease are confirmed.

Additional keywords: Pseudomonas sp., electron microscopy.