Fungi are eukaryotes and can be either filamentous as molds or unicellular as yeasts. The filaments are called hyphae, and together are called the mycelium. Some fungi can be dimorphic, in which the organism can exist as either a mold or a yeast, depending on the environmental conditions. With pathogenic fungi, the mold is typically the environmental form of the organism, and the yeast is the pathogenic form. Pathogenic fungi include Histoplasma capsulatum, Candida albicans and Crytococcus neoformans.


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