TAUBENHAUS: SILVER SCURF OF THE WHITE POTATO 559 



11. Appel, Otto, & Laubert, R. Die Konidienform unci die pathologische 



Bedeutung des Kartoffelpilzes Phellomyces sclerotiophorus Frank. 

 Arbeit. Kaiserl. Biol. Anst. fiir Land- und Forstw. 5: 435-441. 

 1907. 



12. Clinton, G. P. Scurf, Spondylocladium atrovirens Harz. Conn. 



Agr. Exp. Sta. Ann. Rep. 31-32: 357-359- 1908. 



13. Eichinger, A. Zur Kenntnis einiger Schalenpilze der Kartoffel. 



Ann. Myc. 7: 356-364. 1909. 



14. Massee, George. Dry scab of potatoes. Spondylocladium atro- 



virens Harz. Roy. Bot. Card. Kew. Bull. 1 : 16-18. 1909. 



15. Clements, F. E. The genera of fungi, 160. 1909. 



16. Massee, George. Diseases of cultivated plants and trees, 478-480. 



1 910 (London). 



17. Bohutinsky, G. Beitrage zur Erforschung der Blattrollkrankheit. 



Zeits. Landw. Versuchsw. in Oesterreich 13: 607-633. 1910. 



18. Manns, Thos. F. The Fusarium blight and dry rot of the potato. 



Ohio Agr. Exp. Sta. Bull. 229: 315-316. 1911- 



19. Erikson, Jakob. Fungoid diseases of agricultural plants [Tr. from 



the Swedish by Anna Molander], 112. 1912 (London). 



20. Taubenhaus, J. J. The black rots of the sweet potato. Phyto- 



pathology 3 : 159-165- I9T3- 



21. Orton, W. A. Potato tuber diseases. Farmers' Bull. 544: 3-16. 



1913- 



22. Melhus, I. E. Silver scurf, a disease of the potato. U. S. Dept. 



Agr. Bur. PI. Ind. Circ. 127: 15-24. 1913. 



23. Bailey, F. D. Notes on potato diseases. Phytopathology 4: 321- 



322. 1914. 



24. O'Gara, P. J. Occurrence of silver scurf of potatoes in the Salt 



Lake Valley, Utah. Science IL 41: 131-132. 1915. 



25. O'Gara, P. J. New species of Colletotrichum and Phoma. Myco- 



logia 7: 38-41. 1915. 



Explanation of plates 41-43 



Fig. I. Spots oi silver scud (Spondylocladitim atrovirens Harz) oi the white potato. 



Fig. 2. Tuber infected with silver scurf, showing shrinkage due to the disease. 



Fig. 3. Crush culture of a silver scurf spot of white potato. The resultant is a 

 pure growth of Colletotrichum atramentarium (Berk. & Br.) Taub. and not Spondylo- 

 claditim atrovirens Harz, the cause of the disease. S. atrovirens is a slow grower and 

 hence easily overrun by more vigorous saprophytes. 



Figs. 4 and 5. Two of the few plates which yielded a culture of Spondylocladium 

 atrovirens from cultured spots of silver scurf. Notice the small colonies of 5. atrovirens 

 intermingled and overrun with Fusaria and Colletotrichum atramentarium. 



Fig. 6. Pure culture of S poyidylocladium atrovirens Harz. 



