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Synopsis This report represents the first in a series of the diatom flora of the Southwest, undoubtedly one of the least understood geographical regions in terms of its aquatic components. Since this area is extremely wealthy in the diversity of its aquatic habitats, the scope of each of these reports will be necessarily limited. Aside from strict floristic analyses, these reports will hopefully provide additional insight into the morphological and ecological variability exhibited by the more commonly encountered diatoms, probably the most singly important photosynthetic component of aquatic systems. The Lower Lake Powell system warrants more detailed analyses of the aquatic components, analyses which will not only confirm the uniqueness of this desert impoundment but also serve as a base from which impact due to inevitable change can be assessed. It is hoped that this study will serve as a preliminary guide to the diatom components and stimulate further interest in the aquatic "oasis" of the Southwest.