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THE DIATOMS OF TIMPANOGOS CAVE NATIONAL MONUMENT, UTAH

A B S T R A C T The diatom flora of the cavern system of Timpanogos Cave National Monument was in- vestigated. Diatoms were found throughout the cave system and were distributed according to moisture and natural openings. Twenty-six species were identified and described, including eight not previously collected from caves and four new records for the state of Utah. permanent lighting system was established by 1925, and the cave system became an important local attraction. Soon after the lighting system was established, it was noted that several of the important natural formations in the caves began to be discolored. In addition, the areas immediately around the lights began to support thick growths of moss gameto- phytes. The discoloration of certain formations due to moss and algae apparently has become in- tensified during the past few years. As a result of these problems, we began an investigation of several prominent cave formations and other lo- calities in the cave system in order to determine what was growing there and to suggest possible control measures. The present paper treats the diatom species in the Timpanogos Cavern system.