126 Report oF THE DervarrMent oF BoraNy OF THE 
seemed to affect the berries but slightly. Very rarely did the 
berries wither from this cause. Peck’s? statement -that the 
fungus does not attack the berries is certainly an error. 
Thinking it possible that the fungus attacks also the wood, 
we made a close éxamination of the canes in the badly affected 
Hepworth plantation and were immediately rewarded by the 
discovery of yellowish pustules which upon microscopic examina- 
tion proved to be the acervuli or spore conceptacles of 
Gleosporium ribis. This was on July 10. Most of the acervuli 
seemed immature, but some of them contained spores identical 
with those found on the leaves, thus leaving no doubt that 
Glaosporium ribis occurs on currant canes. At our next visit, 
July 25, it was found that the acervuli were mostly mature and 
contained an abundance of typical G. ribis spores. <A quality of 
the affected canes was collected and preserved. They will prob- 
ably be distributed in Seymour and Earle’s Economic Fungi. So 
far as observed, the acervuli occur only on wood of the present 
season’s growth. The color of the acervuli is pale yellow or 
light brown and differs but little from that of the cane. Conse- 
quently, they are inconspicuous. However, when they are num- 
erous, one acquainted with them may locate them with the 
unaided eye. The fungus seems to do very little harm to the 
cane, producing but a trifling discoloration of the bark and none 
at all of the wood. 
We believe this to be the first account of the discovery of 
Gleosporium ribis on currant canes. Considering the inconspicu- 
ousness of the acervuli, it is not strange that they have been 
overlooked. It is also possible that under ordinary circum- 
stances the fungus does not attack the canes. Whenever a 
plant disease becomes epidemic it is likely to behave somewhat 
differently from its usual manner. However, be this as it may, 
the discovery is an important one because it shows where the 
fungus probably passes the winter and that the canes are to be 
considered a source of infection in the spring. 
*Peck, C. H. Rep. N. Y. State Mus. Nats Hist., 43:52, 
