MICR 2533 Mycology - Fungi areeukaryoticorganismsthatdo

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Fungi are eukaryotic organisms that do not contain chlorophyll, but have cell walls, filamentous structures, and produce spores. These organisms grow as saprophytes and decompose dead things. There are between 100,000 to 200,000 species. About 300 species are presently known to be pathogenic for man. Medically important fungi are in four phyla. The first three phyla are “perfect fungi”, meaning they have a sexually reproductive stage. 1. Ascomycota – Members of this phylum contain sexual reproduction within a specialized cell called an ascus. The gametes formed are called ascopspores 2. Basidiomycota –Phylum for which sexual reproduction produces basidiospores, which form on the surface of a specialized cell called a basidium. 3. Zygomycota – Phyla members undergo a process where neighboring hyphae fuse then undergo meiosis (formation of gametes) to form zybospores. The fourth phylum, “imperfect fungi,” includes most pathogenic fungi. 4. Mitosporic Fungi (Fungi Imperfecti) – These fungi have no recognizable form of sexual reproduction. Mitosporic fungi form conidia, which are reproductive structures
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MICR 2533 Mycology - Fungi areeukaryoticorganismsthatdo

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