1916] PARASITIC RHIZOCTONIAS IN AMERICA 339 



Cauliflower. A culture of Rhizoctonia from cauliflower was obtained in 1912, 

 from Dr. C. W. Edgerton, Baton Rouge, Louisiana. This culture was isolated 

 from diseased cauliflower seedlings in the summer of 1912, so that it was a 

 comparatively fresh culture when received here. 



Chenopodium. A culture was isolated during the summer of 1913 from ma- 

 ture plants of Chenopodium album growing along the border of the old herbaceous 

 grounds back of the floricultural greenhouses. 



Clover. A culture of Ehizoctonia from red-clover roots was received from 

 Mr. E. A. Arzberger, Wooster, Ohio, March 3, 1913. The fungus was isolated 

 by him from red -clover roots in the greenhouse in December, 1912. 



Coleus I. This strain was obtained from coleus cuttings found damping off 

 in the floricultural greenhouses, November, 1912. 



Coleus II. A culture was isolated from coleus seedlings damping off in seed 

 pans, October, 1913, in the floricultural greenhouses. 



Corn. The strain from corn was obtained from Dr. J. J. Taubenhaus, New- 

 ark, Delaware, in 1912. He stated that the fungus had been isolated from corn 

 seedlings that were damping off in the greenhouse. 



Cotton. Three cultures of Rhizoctonia from cotton received from two 

 sources at different times, were used in these experiments. The strain ' ' Cotton I ' ' 

 was received from Dr. C. W. Edgerton, Baton Rouge, Louisiana, November 12, 

 1912. This strain was cultured by him in September, 1911, from young diseased 

 plants. The strain ' ' Cotton II ' ' was also received from Dr. Edgerton. This 

 strain was cultured in February, 1912, from the same kind of material as the 

 above. . The third strain, * < Cotton III, ' ' was received from Dr. F. C. Wolf, 

 Auburn, Alabama, December 12, 1912. The fungus was isolated from seedling 

 cotton plants growing in the station greenhouse at Auburn. 



Diantlius. Cultures of Rhizoctonia were isolated during July, 1913, from 

 diseased plants of several species of Dianthus growing in the perennial garden. 

 The strains cultured and used in the experiments were * ' D. barbatus N. P.," " D. 

 barbatus S. M., " "D. plumarius," and "D. sequeri. " 



Eggplant. Two strains of Rhizoctonia were isolated from eggplant: one, 

 causing a fruit rot, was cultured August, 1912; the other was isolated from seed- 

 lings damping off in flats in the vegetable-gardening greenhouse, July, 1913. 



Gypsopliila repens. A culture of Rhizoctonia was isolated during July, 1913, 

 from diseased Gypsophila plants in the perennial garden. 



Lavatera. A culture was isolated in 1913 from seedlings of lavatera found 

 damping off in pans in the floricultural greenhouses. 



Lettuce. The strain from lettuce was obtained by Mr. Anderson in 1911, 

 from Cornell University. 



Poinsettia. Cultures were obtained from damping-off poinsettia cuttings 

 found in the floricnitural greenhouses, October, 1912. 



Potato. Several strains from potato were used in these experiments. Two 

 of these strains were obtained from scrapings of the hymenial layer of the Corti- 

 cium stage. 



"Potato R.P.C. " A culture of this strain was isolated from fresh potato 

 stems received from Dr. I. C. Jagger, Williamson, New York, September 2, 1912. 

 This material contained the perfect stage, Corticium vagum B. & C. Pure cul- 

 tures of Rhizoctonia were obtained from scrapings of the hymenial layer. 



"Potato R.P.I." In response to a letter from Mr. Anderson, Dr. Geo. ] 

 Pethybridge, Clifden county, Galway, Ireland, sent a small box of potato stems 

 containing the perfect stage, Corticium vagum B. & C. This material was sent by 

 post, July 18, 1912, and received August 5. A pure culture of Rhizoctonia was 

 obtained from scrapings of the gray mycelium of the Corticium stage. 



"Potato R.P.O. " A culture from potato was obtained by Mr. Anderson 

 from Cornell University. The strain was old and grew very poorly on agar. 



"Potato R. Sol." This strain, like the preceding one, was obtained by Mr. 

 Anderson from Cornell University. It also grew very poorly on agar. 



Eadish.A culture of Rhizoctonia from radish was obtained from Gorne 

 University, by Mr. Anderson, in 1911. This form was very old and probably h 

 been in culture several years. It was lost in April, 1913. 



