408 Witson: NortH AMERICAN P ALES 
Plasmopara viticola Berl. & De-Toni, in Sacc. Syll. Fung. 7: 338. 
1888. 
Hypophyllous, caulicolous, or on young fruits, covering 
the host with a white downy growth, or causing a brown rot of 
the fruit without producing aerial hyphae; conidiophores fascicu- 
late, 250-850 x 5-8 yw, 4-5 times branched, the ultimate branch- 
lets about 8 y long; conidia elliptic-ovate, very variable in size, 
9-12 X 12-30 #; Odspores 30-35 #4; epispore brown, wrinkled, 
or almost smooth: odgone thin-walled, hyaline or light yellowish- 
brown, 
This is one of the worst fungous pests of the vineyard. It 
was first collected in the United States by Schweinitz in 1834, and 
referred to Botrytis cana Link. Later Ravenel, Curtiss, and others 
sent material from South Carolina and New England to Berkeley 
and de Bary. The first published account of the species which 
has come to our notice is by Berkeley, who, in publishing a trans- 
lation of one of Léveillé’s papers upon the O/dium of the vine, re- 
marks that “a true Botrytis of the same section with Botrytis in- : 
Jestans* but far more beautiful, and highly developed, occurs in 
South Carolina on vine leaves. I have not, however, heard that 
it is injurious. My specimens. which were gathered by Mr. 
Ravenel, and have been named B. viticola Berk. and Curt., 
occurred on Vitis aestivalis, and, I believe, on some other 
species,” + . 
In more recent years mycologists of this and other countries 
have experienced a decided change of opinion as to the injurious 
character of the disease. Berlese t estimates that 75 per cent. of 
the crop is destroyed in the northern states by this disease. That 
this is as extreme a view as the one previously. quoted is not im- 
probable, yet that great injury, especially to some varieties, is due 
to this fungus is certain. The most destructive form is that which 
occurs on the fruits as a brown rot. 
ON VITACEAE: 
Parthenocissus quinguefolia (L.) Planch., Alabama, Under- 
‘wood ; Minnesota, Farlow (N. Am. Fungi 702, on 
‘“ Ampelopsis quinquefolia ”), Seymour; New York 
Jackson, 1124, ° . 
_ * Phytophthora infestans (Mont. )deBary. 
_.» T Jour. Hort. Soc. London 6: 289, note, 1851, 
t Riv. Pat. Veg. 9: 102. 1902, 
facia necnt 
