Explants of Chrysanthemum stem were cultured on four different media on all of which callus was produced. This callus and explant tissue was then sub‐cultured on to one of two media, making eight different treatments. One of these treatments in which explants were cultured on a medium containing 2 mg/1 1‐naphthaleneacetic acid (NAA) and 0.8 mg/1 kinetin, and then sub‐cultured onto a medium containing 1 mg/1 kinetin and 1 g/1 soya peptone produced numerous shoots. The value of this finding for the propagation of chrysanthemum is discussed. The technical assistance of Helen Krebs, Sheila Bruce and Maria Bagnall is acknowledged. I also thank Dr. J. L. Bailey for discussions and encouragement.
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Gillian Hill (1968) studied this question.