HYPOBIOSIS IN FUNGI 117 



2- L. E. Hawker, Physiology of the Fungi, University of London Press, 



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25 J. G. Leach, Minn. Univ. Agr. Expt. St a. Tech. Bull.. So. 14 (1923). 



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29 N. Fries, Arch. MikrobioL, 12 (1941) 266. 



^0 N. Fries, Symbolae Botan. Upsaliensis, 6 (1943) 1. 



31 M. C. Ferguson, U.S. Dept. Agr. Bur. Plant Ind. Bull.. 16 (1902). 



32 D. J. de Zeeuw, Phytopathology, 33 (1943) 530. 



33 R. Brown, Nature, 157 (1946) 64. 



3^ F. R. Jones, U.S. Dept. Agr. Bull., 759 (1919). 



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36 C. E. Yarwood. Mycologia, 757 (1946) 64. 



3' F. R. Forsyth, Can. J. Botany, 33 (1955) 363. 



38 P. J. Allen, Phytopathology, 45 (1955) 259. 



39 L. E. Hawker. Plant Pathology. Vol. 2, Academic Press, New York, 1960. 

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42 K. S. Bedi. Indian PhytopathoL, 11 (1958) 29. 



43 K. S. Bedi. Indian PhytopathoL. 11 (1958) 110. 



DISCUSSION 



Keynan : You mentioned that spore germination occurred on 

 a special variety of growing yeast : can this be replaced by yeast 

 extract? 



Wahl: It may be possible, we did not try it, however, other 

 yeast varieties did not give the same effect. 



Mayer: I have heard of a case of uredospores being stimulated 

 by coumarin, are any other cases known? What is known of the 

 properties of sclerotia, and what characterizes them as dormant 

 organs? 



Wahl: Van Sumere^ and his associates ascertained that 

 coumarin, o-coumaric acid, indolacetic acid and some other 

 compounds cause a marked stimulation of the uredospores' 



