| microsporum racemosum: first isolation in the united states. | what is believed to be the first isolation in the united states of the dermatophyte microsporum racemosum (2) was obtained from a 79 year old white male. the patient had numerous excoriations on the forehead, scalp, and nape of the neck. (fig. 1) a culture of scrapings from the forehead grew out a flat, granular, cream-colored colony with a red cherry-colored pigment on the reverse. (fig. 2). the growth was exceedingly rapid, reaching a thallus of 40 mm. in diameter within 15 days. on microscopi ... | 1976 | 995173 |