558 memoirs of the new york botanical garden 



Summary 



1. It has been proved that Spondylocladium atrovirens Harz is 

 the cause of the disease known as silver scurf. 



2. The fungus Phellomyces sclerotiophorus Frank is not in any 

 way connected with Spondylocladium atrovirens Harz. 



3. The fungus Phellomyces sclerotiophorus Frank, although very 

 prevalent on the silver scurf spots, is merely a secondary invader. 



4. It has been shown that the genus Phellomyces is not valid, 

 since the genus belongs to Colletotrichiim. 



5. Phellomyces sclerotiophorus Frank is the same as Vermicularia 

 atramentaria Berk. & Br. and the same as Colletotrichum solani- 

 colum O'Gara. 



6. Following the rules of priority Colletotrichum solanicolum 

 O'Gara becomes Colletotrichum atrame?itarium (Berk. & Br.) Taub. 



7. Colletotrichum atramentarium is apparently a saprophyte or 

 at best, a very weak parasite. 



8. Silver scurf is carried with the seed and soil. 



9. Silver scurf is only a skin disease. 



Bibliography 



1. Berkeley, M. J., & Broome, C. E. Notices of British fungi. Ann. 



and Mag. Nat. Hist. H. 5: 378-379. 1850. 



2. Harz, C. O. Einige neue Hyphomyceten Berlin's und Wien's nebst 



Beitragen zur Systematik derselben. Bull. Soc. Imp. Nat. 

 Moscow 44: 129-130. 1871. 



3. Halsted, B. D. Seventh annual report 352-354. 1894. 



4. Stewart, F. C. Potato diseases on Long Island in the season of 



1895. N. Y. (Geneva) Agr. Exp. Sta. Bull. loi : 83-84. 1895. 



5. Frank, A. B. Die Fleckenkrankheiten der Kartoffclschale mit dem 



Phellomyces sclerotiophorus Frank. Kampfbuch gegen die Schad- 

 linge unserer Feldfruchtc 182-185. 1897. (Berlin.) 



6. Frank, B. Die Phellomyces Faulc. Ber. Deutsch. Bot. Ges. 16: 



280-281. 1898. 



7. Allescher, A., in Rabenhorst, L., Krypt. Fl. i'': 512. 1901. 



8. Saccardo, P. A. Syll. Fung. 4: 681. 



9. Johnson, T. Phellomyces sclerotiophorus, a cause of potato scab 



and dry rot. Econ. Proc. Roy. Soc. Dublin i: 161-165. 1903. 

 10. Appel, Otto, & Laubert, R. Die Konidienform des KartofTclpilzes, 

 Phellomyces sclerotiophorus Frank. Ber. Deutsch. Bot. Ges. 23: 

 218-220. 1905. 



