Abstract
Three species of microsporidia from a population of winter moths, Operophtera brumata (L.), were examined by light microscopy. Pleistophora operophterae (Canning, 1960) is redescribed. The stages with one or two nuclei which were originally termed presporonts are now interpreted as fragments of disrupted vacuolated sporonts or prematuraly separated sporoblasts. The range of spore numbers within sporophorous vesicles is modified to 4 to c.60, rather than 10 to c.100. This species cannot be retained in the genus Pleistophora Gurley, 1893, redefined by Canning & Nicholas (1980), but ultrastructural studies are required before taxonomic reassignment is attempted.
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