A Disease of Currant Canes. 



37 



touching a flamed needle into a colony containing many conidia, and 

 touching again to the stems. The only resulting growth, at first, was a thin, 

 sparse mycelium, which was scarcely noticeable. No white cushions were 

 produced. After about two weeks growth, in two of the cultures, minute 

 red points appeared. When these had increased to the size of a pin-head 

 minute red protrusions were pushed out from the summits of several of them. 

 When examined under the microscope, each red point was found to be a 

 stroma composed of compact hyphae, but bearing no conidia. The protru- 

 sions presented every appearance of being forming perithecia. Unfortu- 

 nately, the cultures were spoiled at this time, so that the resulting growth 

 could not be traced. 



i6. Myceliufn of Pleouectria producing secondary conidia. 



Mycelium of Pleonectria was also innoculated to bean stems on which 

 cultures of Tubercularia were growing, but the growth seemed to be in no 

 way modified thereby. 



Innoculations. 



On May 4th, 1896, a series of innoculations of Nectria^ Pleonectria and 

 Tubercularia was made on currant cuttings. These were kept for a time in 

 a forcing room in the conservatories, but were soon placed out-of-doors, 

 after several of the plants had been attacked and killed by another fungus 

 {Botrytis). About June 25th, several small, pink Tubercularia-\\k& bodies 

 appeared on two of the dead stems. These bore no conidia. Nothing has 

 yet been produced on the living plants, nor, in the light of Mayr's experi- 

 ments noted on a previous page, could results be expected in so short a 

 time. 



