Novres ON THE ERYSIPHACEAE 95 
spread in Europe, the whole gooseberry crop would be seriously 
affected. Beach (/. ¢.) observes: “spraying to prevent mildew 
should begin as soon as the buds begin to unfold, using one 
ounce of potassium sulphide for every two gallons of water. Re- 
peat the applications at intervals of ten days till the fruit is nearly 
ready to market. Should frequent heavy rains occur spray more 
frequently. Be sure the spray reaches all the foliage, especially 
on the inner and under parts of the bush which are usually 
slighted. The use of Bordeaux mixture is objectionable because 
it is apt to stick to the fruit and injure its market value, even 
though the application be made several weeks before the crop is 
marketed.” 
A valuable account, describing the mode of attack, best meth- 
ods of prevention, etc., has also been given by Halsted (23). 
S. euphorbiae (Cast.) Salm. 
Botrytis euphorbiae Cast. Supp. Cat. Pl. Mars. 81. 1851. 
(For further synonymy cf Monograph, p. 71.) 
Syn..add: Oidium euphorbiae Thiim. mss. in herb. 
Exsicc. add: *Rehm. Ascomycet. 1049. 
Ffosts, add; Euphorbia Cyparissias palustris. 
The specimen in the Kew Herbarium, ex herb de Thimen, 
named “ Oidium euphorbiae Thiim. mss. on Euphorbia dulcis, 
Austria inf., Krems, 7.71’ belongs to the present species. 
S. Lanestris Harkn. (Monograph, p. 74) 
Syn. S. Kusanoi P. Henn. & Shirai, Engler’s Bot. Jahrb. 29: 
145. 1900. 
Flosts, add: Quercus glandulifera. 
Distrib. add: Japan; Prov. Kozuké, Mt. Myogi (Kusano, 
Nov. 4, 1899). Mt. Tsukuba (T. Nishida, Nov. 2, 1900)! 
Hennings and Shirai (31) have lately described a Sphaerotheca 
from Japan as a new species under the name of S. Kusanot, Dr. 
Hennings has kindly sent me a specimen of this fungus (now in 
the Kew Herbarium) labeled ‘on Quercus glandulifera, Prov. 
Kozuké, Mt. Myogi (Kusano, no. 123, Nov. 4, 1899). This fun- 
gus is, in my opinion, S. /azes¢ris in a slightly immature condition. 
The authors remark of S. Kusanoi: “ Die Art ist mit S. Zanestris 
Harkn. verwandt, aber duch das vollig farblose Mycel, durch die 
