Strains of Pityrosporum orbiculare were isolated from the 2~¢alassezia furfur infected scales of ten cases of tlnea versicolor. The morphologic characteristics of M. furfur in the scales and P. orbiculare in culture are described. Specific antiserum to P. orbiculare (strain # 7) was produced by injecting the organism into the foot pads of guinea pigs. The capacity of the serum to combine with P. orbiculare and M.furfur was determined by fluorescent antibody staining. These investigations have shown morphologic and antigenic relationships between P. orbiculare and * Currently assigned to Dix souches de Pi~rospotura orbiculare ont ~t6 isoMes ~ partir de squames infect~es par Mal~sezia furfur et provenant de dlx cas de Pityriasis v~sicolor. Les caract~res morphologiques de M. furfur et de at Yale University on July 13, 2015 http://sabouraudia.oxfordjournals.org/ Downloaded from 5.--M. furrier, germinating conidium, PAS stain. X 4250. 6.--M.fu~fur, buds emerging through collarette of parent cells, PAS stain. × 4250.

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