Abstract

The collections on which this series of notes is based were, unless stated otherwise, made during the season of 1952. Powdery mildews, undetermined as to species, have been observed on the following hosts, upon which such fungi have not been previously recorded as occurring in Wisconsin: Solidago filexicaulis (latifolia), Columbia Co., Gibraltar Bluff near Okee, September 23, 1951; Potentilla norvegica var. hirsuta, Dane Co. near Sauk City, September 5; Asclepias syriaca, Dane Co., Madison September 8; Asclepias phytolaccoiides, Dane Co., Madison, September 19; Chrysanthemum parthenium, Dane Co., Madison, July 19.

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