16 BULLETIX 82, TJ. S. DEPARTMENT OF AGKICULTUBE. 
Melhus, I. E. 
1913. The powdery scab of potato {Spongospora solani) in Maine. Science, n. s., 
v. 38, no. 969, p. 133. 
Mop.se, W. J. 
1913, Powdery scab of potatoes in the United States. Science, n. s. , v. 38, no. 
967, p. 61-62. 
Osborx, T. G. B. 
1911. Spongospora subterranea, (Wallroth) Johnson. Annals of Botany, v. 25, 
no. 98, p. 327-341, pi. 27. 
PeTHYB RIDGE, G. H. 
1910. Potato diseases in Ireland. Department of Agriculture and Technical 
Instruction, Ireland, Journal, v. 10, no. 2, p. 241-256, 8 fig. 
1911. Investigations on potato diseases. Department of Agriculture and Tech- 
nical Instruction, Ireland, Journal, v. 11, no. 3, p. 417^49, 14 fig. 
1912. Investigations on potato diseases. Department of Agriculture and Tech- 
nical Instruction, Ireland, Journal, v. 12, no. 2, p. 334-360, 5 fig. 
1913a. On the nomenclature of the organism causing ' ' corky- " or ' ' powdery -scab " 
in the potato tuber, Spongospora subterranea (Wallroth) Johnson. Journal, 
Royal Horticultural Society [London], v. 38, pt. 3, p. 524-530. 
19135. Investigations on potato diseases. Department of Agriculture and Tech- 
nical Instruction, Ireland, Journal, v. 13, no. 3, p. 460-461. 
YTallroth, F. W. 
1842a. Der Knolienbi-and der Kartoffel. Linnaea, 3d. 16, Heft 3, p. 332. 
1842&. Die Naturgeschichte der Erysibe subterranea Wallr. In his Beitrage zur 
Botanik, Bd.\ Leipzig, p. 118-123, pi. 2, fig. 12-15. 
lS42c. [Uber die bekannte Krankheit an der Schale der Kartoffelknoiien.] 
Flora, Jahrg. 25, Bd. 1, No. 8, p. 119; No. 9, p. 133. 
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