206 ReEportT oF THE BoOTANIST OF THE 
with a white mycelium. Pieces of the fungus covered roots were 
stuck into wet sand in a sterilized Mason fruit jar. In this culture 
the white mycelium was gradually replaced by numerous light © 
brown rhizomorphs and after three months the roots became 
thickly covered with the conidial fructification of Dematophora. 
The sporophores measured from one to one and one-half millimeters 
m height. To the unaided eye they appeared to be short, brown 
stalks with colorless or purple ovoid knobs on their ends. Under 
the microscope the brown stalks proved to be compound sporo- 
phores, composed of brown, septate hyphze; and the colorless, 
ovoid knobs were composed of small, colorless, ovoid spores borne 
on the branched free ends of these hyphe. The fungus agreed 
elosely with Hartig’s description™ of Dematophora necatrix except 
that the hyphe composing the rhizomorphs were destitue of pyri- 
form swellings at the septa. 
The Dematophora, and not the walnut tree, was probably the 
eause of the death of the vines. Some of the dead vines were 
certainly beyond the reach of the roots and shade of the tree. 
The soil was a sandy loam and well drained. See Gooseberry 
Root Rot, page 203. 
CHLOROSIS OR YELLOW FOLIAGE. 
In an old but well cared for vineyard at Coxsackie we found 
many plants showing yellow foliage by June 1. The yellow 
leaves were much dwarfed. Sometimes the whole vine was af- 
fected, but it often happened that a part of a vine would be di- 
seased and a part healthy. According to the owner, affected canes 
die the following winter. When all of the canes are affected and 
die, new canes come up from the root. The affected plants 
were scattered irregularly over the vineyard. 
Chlorosis may be due to several causes. Not having had oppor- 

24 Hartig, R. Dematophora necatrix, n. sp. Untersuchungen aus d. forst- 
botan. Institut zu Miinchen. III, 1883. 
