904 Report or THE BorTaNIST OF THE 
in one of the Station vineyards for six seasons. Although but 
few of these plants had been grown thriftily, none of them had 
shown pronounced symptoms of disease. Accordingly, we were 
surprised to find the roots of many of them covered with the same 
fungus which had been found on the diseased gooseberries at Marl- 
boro. The fact that it occurred on apparently healthy plants 
caused us to doubt the correctness of our former conclusions. 
Pieces of the fungus-infested roots were stuck in moist steril- 
ized sand in a Mason fruit jar previously made sterile by a solu- 
tion of corrosive sublimate. In about six weeks they began to 
show conidial fructification lke that of Dematophora. 
From diseased grape roots placed in the Mason jar sand cul- 
tures we had previously obtained the conidial fructification of a 
Dematophora. (See Grape Root Rot.) The rhizomorphs of the 
gooseberry fungus were strikingly like those of the grape Dema- 
tophora except that the hyphe composing them were slightly 
smaller. Accordingly, we expected to get the same sort of 
conidial fructification; but the spores of the gooseberry fungus 
were larger and the branching of the sporophores different. 
We believe the gooseberry fungus to be a species of Dematophora, 
but there is some doubt about it being an active parasite. 
During the past season the gooseberry disease at Marlboro 
spread but little owing probably to the dry season. In the wet 
season of 1898 it made rapid progress. The owner of the dis- 
eased gooseberries believes that the plants have died through some 
evil influence of a large black walnut tree*’ which stands at the 
corner of the plantation where the disease started; but it is scarcely 
possible that this can have been the direct cause. 
DWARFED FOLIAGE. 
In another gooseberry plantation we saw a few plants which 
appeared healthy, except that all of the leaves were abnormally 
23 For another case of supposed injury by black walnut tree, see Grape Root 
Rot on pages 297-298. 
