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Abstract: Mycogone perniciosa is a common pathogen of the cultivated mushroom (Agaricus bisporus (Lange) Sing.) causing the disease known as Wet Bubble. Although it is world wide in its distribution it varies considerably in its incidence on individual farms. Rhopalomyces elegans is a Phycomycete and is a member of the Mucorales. It is known to be a pathogen of the eggs of nematodes (Ellis and Hesseltine, 1962) and has been grown on an agar medium containing liver and lamb fat. Ellis (1963) reported finding R. elegans heavily parasitized by Streptomyces griseus and recently Dayal and Barron (1970) and Barron and Fletcher (1970) have demonstrated in vitro parasitism of this fungus by various species of Verticillium including V. psalliotae, another mushroom pathogen. M. perniciosa has a verticillate conidial stage and was tested in vitro for its ability to parasitize R. elegans.
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