88 SALMON: SUPPLEMENTARY 
var. Szdirvica, Sapporo, Sept. 17, 1890, coll. E. Tokubuchi,” and 
‘on the leaves of V. Stbirica, Sapporo, Oct. 10, 1894, coll. N. 
Hiratsuka,’’ belongs, as mentioned above, to the S. hamuli type. 
The perithecia measure about 100 y in diameter, and the cells of 
the outer wall average 15 » wide. I. Sidirica is treated by most 
botanists as synonymous with V. Virginica. 
Corda’s figures of his ‘ Zoruda epilobii”’ well represent the 
conidial (Ozdiwm) stage of S. humuli, which occurs not uncom~- 
monly on species of Epilobimm. Saccardo has transferred Corda’s 
Torula epilobii to the genus Oospora—evidently by a slip, as in the 
key to the genera of the Yyphomycetes (Saccardo, Syll. 4: 3) Oospora 
is placed in the section comprising genera which contain ‘species 
saprophilae,” and Corda expressly described his plant as parasitic. 
During the season 1900. S. humuli was the cause of the de- 
struction of the strawberry crop in many districts of England. 
The fungus, in its conidial stage—to which the name Oidium 
FSragariae Harz has been given on the Continent—spreads from psi 
leaves of the strawberry plant to the fruit, investing it with a white 
powder, and ruining it for market purposes. I have already (7 
and 72) given an account of this outbreak of the “strawberry mil- 
dew,” with notes as to the varieties which are most attacked and 
those which appear to be immune. The fungicide which was found 
to be most effective was prepared in the following manner: one 
ounce of carbonate of copper is mixed with 5 ounces of carbonate 
of ammonia, and dissolved in a quart of hot water; when dissolv 
16 gallons of water are added. The plants should be sprayed re- 
peatedly with this fungicide as soon as any trace of the mildew 4P 
pears on the leaves, for it has been found that once the fungus = 
in full vigor on the fruit nothing can be done to save the crop- 
Professor McAlpine reports from Australia that during 190? 
strawberry plants were very severely attacked by a “ strawberty 
Oidium,” and that although the strawberry plants were carefully 
examined at the end of winter, no perithecial stage could be found. 
The disease known to hop-farmers under the name Ob 
mould”’ is probably caused, as Hammond (24) has pointed out, by 
S. humult. In hops attacked by “red mould” the bracts of the 
cones lose their normal bright yellowish-green color, and become 
tinged reddish-brown. Other writers, however, have stated 
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