VARIOUS OBSERVATIONS 



77 



power of responding to certain stimuli, particularly that of 

 gravity. 1 



The Grafting of Fruit-bodies. In 1911, Weir found by experi- 

 ment that, when a young stipe of Coprinus lagopus (his Coprinus 



FIG. 24. Polyporus rufescens. Several normal somewhat confluent fruit- 

 bodies springing from fleshy-soft bases. The stipes exhibit negative 

 geotropism, the pilei diageotropism, and the hymenial tubes positive 

 geotropism. Photographed at Salem, Ohio, U.S.A., by Burtt Leeper. 

 Natural size. 



niveus) is grafted on to the stump of another stipe of the same 

 species, a union quickly takes place and the pileus expands in a 



1 It would be interesting to make a cytological comparison of normal and 

 abnormal fruit-bodies. The number, arrangement, or size of the nuclei in the 

 abnormal form may possibly be different from that of the normal form. 



