Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: 8/28/2001
Publication Date: N/A
Technical Abstract: Tilletiales is an order within subclass Exobasidiomycetidae (Ustilaginomycetes) comprising genera Tilletia, Neovossia, Conidiosporomyces, Ingoldiomyces, Oberwinkleria and Erratomyces. Morphological characters used to distinguish Neovossia from Tilletia include local infection, large number of non-conjugating basidiospores, lack of sterile cells and absence of trimethylamine odor. However, at least 20 species with intermediate basidiospore characters are known, but only the type species,N. moliniae, lacks both sterile cells and trimethylamine. Ingoldiomyces and Conidiosporomyces are monospecific genera distinguished by forcibly discharged primary basidiospores and Y-sha oral conidia, respectively. Partial nuclear large subunit rDNA sequences of 25 species representing five of the six genera were analyzed in order to examine generic limits. Sequence analysis does not clearly separate Tilletia, Neovossia and Ingoldiomyces; Conidiosporomyces formed a basal branch within a well-supported group containing the other taxa. These results suggest that a reevaluation of characters currently used to delimit genera in this order is required.