PHOTOCONTROL OF VEGETATIVE GROWTH 135 



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Downs, R. J., and H. A. Borthwick. 1956. Effects of photoperiod on the growth 

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Downs, R. J., S. B. Hendricks, and H. A. Borthwick. 1957. Photoreversible 

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Hendricks. S. B., H. A. Borthwick, and R. J. Downs. 1956. Pigment conversion 

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Liverman, J. L.. M. P. Johnson, and L. Starr. 1955. Reversible photoreaction in 

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Mohr. H. 1956. Die Beeinflussung der Keimung von Farnsporen durch Licht 

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