Microscopic findings in skin scales from pityriasis versicolor were studied. Various methods for cultivating Pityrosporum orbiculare were tested. The organism showed both yeast and filamentous forms depending on environmental conditions and steroid levels, resembling Malassezia furfur.
Fragner P. (1971): Pityrosporum orbiculare und seine Züchtung. – Česká Mykologie 25(4): 219–230.