Two types of frustular aberrations in cultures of Surirella ovalis Breb. have been observed. The first is a "notch deformity" occurring in approximately 0.1% of the population. It is produced by mechanical distortion where the cells are crowded. This deformity is passed to daughter cells in each successive vegetative division. The second type is characterized by the presence of one or more aberrant raphe canals crossing the valve face in various directions. It occurred only in cultures exposed to continuous light for two weeks. Little or no cell division occurred during this period. The raphe canal aberrations, which occurred in about 0.01% of the exposed population, may have resulted from abortive cell divisions. They were not observed to continue in later transfers of the exposed populations to normal growth conditions.
Proceedings of the Iowa Academy of Science
©1964 Iowa Academy of Science, Inc.
Drum, Ryan W.
"Notes on Iowa Diatoms. VI. Frustular Aberrations in Surirella Ovalis,"
Proceedings of the Iowa Academy of Science, 71(1), 51-55.
Available at: https://scholarworks.uni.edu/pias/vol71/iss1/9