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SUMMARY

Although Prototheca is generally considered to be a colorless member of the Chlorococcales, there have been a number of attempts to relate it to the fungi. However, our ultrastructural observations support the conclusion that it is indeed a nonphotosynthetic alga and not a fungus. One such structural feature that is of special interest is the presence of membrane-bounded starch granules which are considered to be storage plastids. Fungi are not known to produce plastids.