DISEASES OF THE QUIKCE. 89 



tained within the peridia may germinate, and produce 

 not only one, but many vegetative spores, which are ex- 

 ceedingly minute, and may be regarded as the embryos 

 of a fresh crop of fungi. If a vertical section be made, 

 the fungi will be seen to spring from beneath, the spores 

 or protospores being clustered at the bottom. The tooth- 

 like fringe is only a continuation of the cellular substance 

 of the cups. 



Tt is possible that the fluid parts of the spores are 

 absorbed by the growing plant, and as the result, the 

 plant has become inoculated with the virus, which is so 

 destructive as often to discourage the horticulturist. It 



Fig. 59. SPORE OP THE K^ES- 

 TILIA, MAGNIFIED 400 



DIAMETERS. Fig. 60. ALLORHINA NITIDA. 



requires a great stretch of the imagination to reach the 

 possible limit of their mysterious increase and consequent 

 injury. 



The spores of the Rmstilia aurantiaca are from 

 twenty-five to thirty thousandths of a millimeter in 

 diameter. 



The only effective remedy yet discovered, is to gather 

 and burn the affected parts of stems and fruit before the 

 spores are scattered to spread the disease. 



The RcBstilia aurantiaca on twigs attracts the com- 

 mon green and brown dung beetle, Allorhina nitida. It 

 \^^,scarib(BidcB about the size of the common brown May 

 beetle, and very strong. This beetle, though a friend to 



