Abstract
About one third of the commercial varieties of Chrysanthemum have arisen as “sports” or somatic mutants. Chromosome studies show that these new forms originate as a result of the loss and gain of chromosomal material during mitosis. Various abnormalities give rise to cells where these has been change in the chromosome number or to cells where chromosome breakage has resulted in the production of fragment chromosomes. It is suggested that most Chrysanthemum varieties are periclinal chimaeras and that sorting out of the different layers can result in the formation of new colour forms.
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