Redescription of Entomophthora muscae (Cohn) Fresenius

Entomophthora muscae (Zygomycetes, Entomophthoraceae) is redescribed from i ts type host, the house fly (Musca domestica L.), based on several collecti ons from Switzerland and from Denmark. The species has subspherical, ellips oidal, kidney-shaped or rounded hyphal bodies measuring 24-54 x 17-41 mu m with 10-24 nuclei (average 15-19). Conidiophores are unbranched and contain 10-27 nuclei (average 15-20). The primary conidia measure on average 27-31 x 20-24 mu m with a length/diameter ratio of 1.20-1.32 and 10-27 nuclei (a verage 15-20). The secondary conidia measure on average 19-24 x 15-19 mu m with a length/diameter ratio of 1.20-1.33. These data correspond with the t ype material deposited in herbaria. They do not correspond with the data gi ven in the original description which is assumed to concern E. schizophorae , which was also found as a pathogen of M. domestica during these investiga tions. Detailed data on morphology, including intraspecific variability of E. muscae are given.