[Dermatomycosis in plaques caused by Botryomyces caespitosus. A new causative agent]

The clinical and histological features of a dermomycosis caused by a new dematiaceum fungus are described. The mycological characteristics of this fungus individualize and differentiate it from other demiataceum hyphomycetes, proposing the name of Botryomyces caespitosus for it. The submicroscopic features are commented, as well.