i] REACTIONS TO STIMULI 33 



or Pofystictus grow out as horizontal plates. 1 lassclbring found that the fruit 

 Ixxlies of Pofystictus cinnabarinus, when rotated on a klinostat during their 

 development, were no longer differentiated into a dorsal sterile and a ventral 

 fertile region, but that hymenial tubes were formed over the whole surface. 

 Alike in the Hydnaceae, Agaricaceae and Polyporaccae the trama plates 

 nt the fertile region are positively geotropic. In stemless forms this reaction 

 is responsible for the orientation of the hymenium; it may be particularly well 

 seen in some of the Hydnaceae where the spines grow downward whatever 

 the orientation of the sporophore, and it could doubtless be demonstrated 

 also in Tremellodon among the Tremellaceae. In stipitate species it appears 

 as a supplementary reaction coming into play if further adjustment is needed 

 when the stipe is fully grown. The limitations of the method in the gill- 

 bearing fungi are obvious for, if the pileus is oblique and the gills undergo much 

 curvature, they become crowded together and interfere with spore dispersal. 



REACTIONS TO STIMULI: BIBLIOGRAPHY 



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1878 STRASBURGER, E. Wirkung des Lichtes und der Warme auf Schwarmsporen. Jena. 

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1906 Pfeffer,W. The Physiology of Plants. Eng. Trans. Clar. Press, Oxford, iii, p. 1 S3. 



1907 HaSSF.LBRING, II. Gravity as a P"orm-Stimulus in Fungi. Bot. Gaz. xhii, p. 251. 



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1909 BULLER, A. H. R. Researches on Fungi. Longmans, Green & Co, London. 



1909 Stevens, F. I., and Hall, J. G. Variations of Fungi due to Environment. Bot. 



1 laz. xlviii, p. 1. 

 1909 Siki 1 1 1 1. s. G. Tin- Influence of Gravity on tin- Direi tion of Growth of Amanita. 



Bot. 1 . ■'/. xlviii, p. 414. 

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 1914 Wager, II. Movements of Aquatic Micro-Organisms in Response to External 



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G -v. ^ 



