Abstract
1. The quality and behaviour of nucleus have been studied in the rhizoid of Dryopteris erythrosora.2. Very striking change of nuclear shape has been observed in a medium containing 2% sodium phosphate, and this change was reversible.3. In Dryopteris, the cell-differentiation may be accompanied by the nuclear differentiation.4. It has been discussed that the nucleus of rhizoids is not indispensable for the elongation.I wish to express my thanks to Dr. T. Shimamura for his cordial guidance during the work.
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