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NoTES ON THE ERYSIPHACEAE 89 
this reddish color is due to the incipient death of cells caused by 
certain atmospheric conditions, excessive dryness of soil, etc., and 
consider that the fact of the red color being sometimes present in 
hops which show no trace of the Sphaerotheca affords conclusive 
Proof that “red mould” is not caused by the present fungus. I 
have, however, found in studying the ‘strawberry mildew” 
disease, caused by S. humuli, that strawberry leaves may com- 
monly be found (after the disease has been running for some time) 
on which no trace of any fungus is to be found, yet which bear 
reddish discolored patches on the under surface. Continuous ob- 
servation of diseased strawberry plants showed that these reddish 
Patches were composed of epidermal cells which had been killed 
or whose contents had been modified, by the haustoria of S. humul, 
and that the mycelium after causing this injury, had completely 
disappeared, 
S. HUMULI FULIGINEA (Schlecht.) Salm. (Monograph, p. 49) 
‘ Syn. add: S. microcarpa Hazslinszky, M. Tud. Akad. Math. 
es Természettud. Kozleményck, 15: 20. 1878. S. phthetro- 
‘perma P. Henn. & Shirai, Engler’s Bot. Jahrb. 29: 147. 1900. 
S. fuscata (B. & C.) Serbinov. Scripta Bot. Univ. Petropol. 18: 
(16). 1901. 
Exsicc. add: Krieger, Fung. saxon. 1210, 1211, 1213, 1214, 
(in herb, Jaczewski) ; Rehm, Ascomycet. 1349b ; Shear, New York 
Fungi, 137 (in herb. Jaczewski). 
: Distrib. add : Europe, Bulgaria (10) ; Asia, Siberia, Yeniseisk, 
flum. Yenisei inter 58° et 71°” (A. Kitmanoff ). 
flosts, add: Arabis alpina, Bidens pilosa, Calamintha umbrosa, 
Clerodendron trichotomum, Corcopsis trichosperma (84), Crepis 
— %S, Impatiens Balsamina, Microseris senella, Phtheirospermum 
Chinense, Saxifraga punctata, Senecio Cineraria (cult.), S. Muh- 
lenbergiz, 
Hosts recorded for the aggregate: ‘“S. Castagnet Lév.” 
add: Arctinin minus (19), Bupleurum linearifolium (59), Calendula 
Sulgens (40), Centaurea Babylonica ( 59), Cnicus arvensis (65), Plan- 
1ag0 major (80), Veronica Chamaedrys (76), V. orientalis (40). 
Hazslinszky described in 1878 (28) a Sphaerotheca from Hun- 
Sary as a N€w species under the name S. microcarpa, with the 
