Abstract
The life spans of Didymium iridis plasmodia, representing isogenic ploidal series, decrease with increasing ploidy levels. Polyploid nuclei, especially 8 N and above, are unstable and rapidly decrease in nuclear size. The survivors of this process reach a stable diploid to tetraploid level which they maintain until the start of programmed senescence. The termination of the life span is then accomplished by a distinct senescent phase which is characterized by progressively increasing nuclear size.
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