Abstract
The effects of various concentrations of kinetin on the development of gametophytes were studied in light and dark cultures of Ceratodon purpureus in liquid media. There was no bud formation in either light or dark control cultures. Buds were produced under the influence of kinetin in light as well as in dark cultures, the effect of a given concentration of kinetin being a little stronger in the light. Kinetin has been thus found to be an essential factor of bud formation in a moss which hardly produces gametophores even in the light. This is believed to be the first report of gametophore formation in the dark since Keil's short communication in 1949. It also represents a new example replacing a morphogenetic light stimulus by kinetin.
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