NorTes ON THE ErRyYSIPHACEAE 91 
recorded (/. c.) under the same on Aidiscus esculen!us bears, accord- 
ing to specimens from Rabenhorst’s herbarium, no perithecia, but, 
from the mycelial characters’ shown, probably also belongs to £. 
taurica. 
The S. Castagnei recorded by Magnus (Bericht. des naturwiss.- 
med. Ver. Innsbruck, 24: 6. 1898, on Caltha palustris, proves 
to be a small form of Exysiphe polygoni DC. 
The fungus recorded as S. humutli Schroet., on Plantago major, 
by Feltgen (18), proves from specimens sent to be £. cichoracearum 
DC.; and that recorded (2. c.) under the same name as occurring 
on ‘ Mentha longifolia”’ proves from specimens sent to be S. 
humuli fuliginea on Veronica longifolia. 
The plants recorded as S. Castagnei Lév. p.p.. Burr. (= S. 
humuli Juliginea) on Shepherdia argentea and Collomia linearis 
from Wyoming, by Griffiths (Bull. Torrey Club, 26: 142, 143. 
1899), prove from specimens sent by the writer to belong to S. 
humuli (DC.) Burr. They are small forms of the species—the 
perithecia in the example on Collomia, measuring 75-100/ in 
diam., and in that on Shepherdia go-110 p—with quite the general 
appearance of the var. fuligineca, but with the cellular structure of 
the perithecium characteristic of the S. humuli type. 
S. PANNosA (Wallr.) Lév. (Monograph, p. 65) 
Exsicc. add: * Linhart, Fung. hungar. 354. 
Distrib. add Europe, Austria-Hungary; Australasia, Tas- 
Mania (62). 
Hosts, add: Rosa Eglanteria (40), R. fragrans (40). 
Spegazzini records (79), Oidium leucoconium Desm. as occurring 
“ad folia viva Rosarum cultarum vulgatum in tota Republica 
Argentina et in Montevideo, per ann., 1880-1897.” If correctly 
determined, this refers to S. pannosa, as Oidium leucoconium is the 
Conidial stage of this species ; it may be noted, however, that in 
orth America a peculiar form of S. Aumuli occurring on roses 
: oie been mistaken for S. pannosa (see monograph, 
The fungus reported by Goethe (21) as S. pannosa, occurring 
on apple trees in Germany, proves to be Podosphaera leucotricha. 
< ‘the case of Cavara’s record, also mentioned by Magnus (46), of 
