Polycytella Hominis is a mutated form of Scedosporium Apiospermum

PCR amplification and sequencing of two separate regions of the nuclear ribosomal repeat region revealed that Polycytella hominis, a hyphomycete isolated from a human case of mycetoma, was genetically indistinguishable from Scedosporium apiospermum (the anamorph of Pseudallescheria boydii). These organisms also exhibited remarkably similar susceptibility profiles to common anti-fungal agents. P. hominis is thus likely a mutant of S. apiospermum showing abnormalities of sporulation, for which a possible mechanism is discussed. Polycytella hominis should thus be regarded as a synonym of Scedosporium apiospermum.