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Viruslike Particles in Penicillium brevi-compactum and P. stoloniferum Hyphae and Spores. G. R. Hooper, Department of Botany and Plant Pathology, Michigan State University, East Lansing 48823, Present address of senior author: Department of Biological Sciences, California State Polytechnic College, San Luis Obispo 93401; H. A. Wood(2), R. Myers(3), and R. F. Bozarth(4). (2)(4)Boyce Thompson Institute for Plant Research, Yonkers, New York 10701; (3)Department of Botany and Plant Pathology, Michigan State University, East Lansing 48823. Phytopathology 62:823-825. Accepted for publication 16 February 1972. DOI: 10.1094/Phyto-62-823.

Viruslike particles were observed in thin sections of hyphae and spores of Penicillium brevi-compactum and P. stoloniferum. The particles in P. brevi-compactum had an average diameter of 36 nm, and occurred throughout the cytoplasm. The particles observed in P. stoloniferum were present in high numbers, and had an average diameter of 26 nm. In both cases, particles were most evident in cultures 10 or more days old.