444 FUNGOUS DISEASES OF PLANTS 



IV. A ROOT AND STEM ROT FUNGUS 

 Corticium vagum B. & C., var. Sol am Burt. . 



ATKINSON, GEO. F. Some Diseases of Cotton. Ala. Agl. Exp. Sta. Built. 41 : 



30-39. 1892. 

 CLINTON, G. P. Rhizoctonia (Rosette). Conn. Agl. Exp. Sta. Rept. (1904): 



325-326. pi. 26. figs. a-c. 

 DUGGAR, B. M., and STEWART, F. C. The Sterile Fungus Rhizoctonia. 



Cornell University Agl. Exp. Sta. Built. 186: 50-76. figs. 15-23. 1901. 



Ibid. N. Y. (Geneva) Agl. Exp. Sta. Built. 186 : 4-3- figs- I5~ 2 3- 1 9*- 

 PAMMEL, L. H. Preliminary Notes on a Root-Rot Disease of Sugar Beets. 



Iowa Agl. Exp. Sta. Built. 15: 243-251. pis. 3-4. 1891. 

 ROLFS, F. M. Potato Failures. (Two Reports.) Colo. Agl. Exp. Sta. Bullts. 



70: 1-20. 1902; 91: 1-33. 1904. 

 ROLFS, F. M. (Tomato Diseases) Corticium vagum Q&. & C.). Fla. Agl. Exp. 



Sta. Rept. (1905): 46-47. 

 SORAUER, P. Pflanzenkrankheiten (2d ed.), /. <r., 354-361. 



A fungus causing important diseases of the potato and perhaps 

 of a large number of other herbaceous and even woody plants has 

 recently been placed under the name above given. The various 



!'!(,. 217. LETTUCE SKKDLINGS ATTACKED BY RHIZOCTONIA 



plant diseases due to this fungus had formerly been referred to 

 the form genus Rhizoctonia, which is a genus established by 

 De Candolle in 1815, including certain sterile fungi occurring 

 upon the roots of plants. There are great difficulties in determin- 

 ing what might be considered species in forms which are re- 

 ferred to this form genus, and the Corticium stage has not yet 



