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The chytrids are mostly forms, traditionally classified as protists. In fact, some sources still classify them with the , even though, so far as we can tell, chytrids have no light-sensitive pigments at all. What chytrids do have is a single- celled with an anterior flagellum, which is distinctly odd for a fungus. In fact, chytrids are the only large taxon of Fungi which produces a zoospore of any kind.
However, there's no real doubt about their position any more. For example Borneman & Hartin (2000) showed that rDNA primers from all of four basic fungal phyla (Trichomycota was not included) permit amplification of rDNA in the other fungal groups, including Chytridiomycota, but don't amplify anything else. This strongly suggests that that rDNA from all four groups was very similar and that all are closely related.
That same conclusion can be reached for any number of other reasons. Chytrids have an absorptive mode of nutrition, like other Fungi. Chytrids have composed of . Chytrids form . They share, with the other Fungi, key enzymes and metabolic pathways that are not found in other fungus-like protozoans (slime molds and water molds), in addition to oddities of molecular structure. Alkemar & Nygard (2003). The chytrids are surely the most Fungi, but Fungi they are.
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Credits Chytridiomycota ATW041115, this page MAK061005