NOTES ON THE ERYSIPHACEAE 97 
Disivib. add: Europe; Bosnia (10). 
flosts, add; Populus suaveolens, Salix gracilistyla, S. multi- 
nervis, S. stipularts. 
Sredinski (80) has recorded from Russia the occurrence of U. 
salicis on Hedera Helix. In all probability, however, the perithecia 
in this case were merely adhering by means of their appendages to 
the leaves, as it is most unlikely that the Hedera was really serving 
asa host plant. “ U. salicis var. epilobii Vestergr.”” on Epilobium 
angustifolium and “ U. Columbiana Selby on Scutellaria lateriflora 
afford apparently similar cases (avte, p. 10). 
Brannon (8) has recorded the occurrence in rare cases, of eight 
spores in the ascus of U. salicis. 
The haustoria of U. sadic’s, according to the observations of 
Grant Smith ('77), differ in an important manner from those of 
other species of the Erysiphaceae, being produced not only in the 
epidermal cells of the host-leaf, but also in the subepidermal (pali- 
sade and mesophyll) cells (ante, p. 4). 
U. Mivazer Salm. (U. salicis var. Miyabei Salm. monograph, p. 88) 
Hosts, add: Tilia Miqueliana. 
From the study of further material, the present fungus, orig- 
inally described as a variety of U. salicis, seems to be worthy of 
Specific rank, the character of the appendages (especially that of 
the basal part becoming, when mature, thick-walled) separating it 
clearly from all forms of U. salicis. Further, I have not been 
able to find among numerous specimens of U. sadicis from Japan. 
any forms approaching in any way U. Miyabet, such as might be 
€xpected to occur were the latter only a variety of U. salicts. 
Since its original discovery in Japan on Alnus incana and A. mari- 
“ma, U. Miyabei has been found at Hokkaido, Prov. Ishikari, Shin- 
totsugawa (coll. T. Hawakami) on Zilia Migueliana see Erysipha- 
Ceae of Japan (68), p. 440. 
U. aceris (DC.) Sacc. (Monograph. p. 90) 
Exsicc. add: * Krypt. Exsicc. (Mus. Pal. Vind.) 123 ; at 2 
Sacc. Myc. Ital. 60 ; * Linh. Fung. hungar. 77, 256. 
Distrib. add: Bosnia. 
Hosts, add: Acer opulifolium, A. palmatum, A. spicatum Uku- 
ruduense, 
