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Phylum Ascomycota – 45,000 species –Most yeasts, truffles, morelsGreat diversity - includes many plant parasites –e.g. Dutch elm disease and chestnut blightSometimes called cup fungi because of the shapeof their reproductive structuresHas well developeddikaryotic stageThe ascocarp carries asciwithin cupsNuclear fusion occurs withinascus, meiosis followsproducing ascosporesSome species lack a sexualstage (e.g. Penicillium)18