Characterized by colourless spores (conidia) that are nearly sessile and usually produced at right angles to the fertile filament, or as terminal swellings. Most conidia are 1- or 2-celled (micro-conidia) but at least a few are more than 2-celled (macroconidia). Similar to Chrysosporium. Usually occurring as a skin parasite (dermatophyte) on man and animals but occasionally isolated from soil, leather, feathers, etc. It is related to Microsporum, another common dermatophyte. Holomorph: Arthroderma. Ref: Ajello, Georg, Kaplan, and Kaufman 1963; Beneke 1958; Rebell and Taplin 1970