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University of Alberta, Edmonton, Canada.
In 1969, specialists at the Kananaskis hyphomycete workshop coined the terms 'blastic' and 'thallic' to describe two distinct modes of conidiogenesis. Since then, the original concepts have been slightly modified and redefined, and the terms have been widely adopted in taxonomic descriptions of conidial fungi. Problems arise in the application of these terms to conidial development in fungi which demonstrate morphological plasticity ranging from fragmentation of a hypha to extrusion of a portion of a hypha or cell. A number of fungi, such as anamorphs of Onygenales which includes many of the fungi pathogenic to man, demonstrate intergradations between blastic and thallic development. Because development in this group of fungi is difficult to categorize, it has led to an inconsistent treatment of taxa which share many other developmental features in common. In using these terms, it should be remembered that they represent extremes in a developmental spectrum.
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