An Ultrastructural Comparison of Conidiogenesis inScedosporium Apiospermum, Scedosporium InflatumandScopulariopsis Brumptii

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Abstract
A comparison of conidiogenesis in Scedosporium apiospermum, Scedosporium inflatum and Scopulariopsis brumptii was conducted with light and transmission electron microscopy. It has been suggested that S. inflatum could occasionally form conidia from sympodially developing conidiogenous cells in addition to forming annelloconidia from percurrently proliferating conidiogenous cells. Careful examination of these three taxa by light microscopy revealed conidial ontogeny that could be mistaken for sympodial development which was actually new growth occurring from beneath the terminal conidium. Expansion of a subapical portion of the conidiogenous cell caused the terminal conidium to be pushed aside, though not always severing it completely from the conidiogenous cell. This process results in an incomplete secession of each terminal conidium, which is virtually identical to the process previously reported for Acrogenospora sphaerocephala.