62 



- MICHIGAN ACADEMY OF SCIENCE. 



3 a number of trpical specimens of mummified fruits were taken from 

 these plants as a result of this innoculation. 



Xo attempts have been made to infect young shoots by means of the 

 ascospores. 



The breaking apart of the conidia is hastened by the formation of little 

 plugs of cellulose, called disjunctors. between the walls of the spores 

 where they are united. These crowd the walls apart, at the place of 

 union, and, later, divide across thus setting the conidia free from each 

 other. 



Some of the conidia were placed in water in a glass cell for forty-eight 

 hours and at the end of that time were found to have germinated, each 

 spore having produced numerous sporidia from all parts of its surface. 

 These sporidia are nearly globose and are very minute, being about 

 three microns in diameter. 



While no record of the occurrence of this disease in this country seems 

 to have been made thus far. it appears to be very prevalent among the 

 species of Vaccinium in this State. In some cases at least fifty per cent 

 of the fruit of a plant has been destroyed by the fungus. 



A similar disease, or possibly the same fungus, has been noticed on 

 Gavlussacia resinosa. but has not yet been studied. 





PLATE II. 



a. Young shoot of Vaccinium producing conidia from the affected stem and leaves, natural size. 



b. Three conidia, highly magnified, showing disjunctors. 



c. A conidium germinating, after being 4S hours in water, by sending out sporidia. 



d. Sporidia highly magnified. 



e. A portion of c more highly magnified. 



f. A mature ascophore attached by its long stem to a diseased Vaccinium berry, natural size. 



g. Young ascophores growing from a diseased berry, 

 h. An ascus and a paraphysis. magnified. 



