ARTHUR: NEW SPECIES OF UREDINEAE 126 
Peridermium on Picea having subcuticular pycnia to be found in 
North America. In Europe one such form is known, which was 
shown by cultures made in 1916 by Ed. Fischer (Mitt. Nat. Ges. 
Bern 1916: 131. 1917) to belong to Pucciniastrum sparsum 
(Wint.) Ed. Fisch., on Arctostaphylos. The American form doubt- 
less belongs to some species of Pucciniastrum, but probably not 
to P. sparsum, as the spores are considerably smaller than in the 
European form of that species. 
PURDUE UNIVERSITY, 
LAFAYETTE, INDIANA 
