[Vol. 2 



444 ANNALS OF THE MISSOURI BOTANICAL GARDEN 



it was considered advisable to make the fungus a variety of 

 the Berkeley and Curtis species, so that it was written Cor- 

 ticium vagum B. & C. var. Solani Burt. Prof. Burt also recog- 

 nized that it agreed closely with, and might be identical with, 

 Ilypochnus Solani Prill. & Del. This conclusion the writer 

 accepts, but in view of the fact that Professor Burt is pre- 

 paring a monograph of the Thelephoraceae, I shall not dis- 

 cuss this point; for the same reason I need only express doubt 

 regarding the validity of Shaw's suggestion that Ilypochnus 

 ochroleucus Noack and Corticium vagum B. & C. are identical, 

 although there is a certain similarity in the various stages. 



Rolfs ('04) was able to germinate the basidiospores and 

 to develop characteristic Rhizoctonia hyphae from these. 

 Riehm ('11) also reported germinating the basidiospores and 

 producing a characteristic Rhizoctonia mycelium together 

 with the formation of sclerotia. Pethybridge ('15) gives a 

 more complete account of mycelial production from spores. 



The herbarium and fresh material which has been examined 

 and found to agree with the authentic descriptions of Rhizoc- 

 tonia Solani Kiihn (Corticium vagum B. & C.) may be briefly 

 enumerated : 



Exsiccati : Rhizoctonia Napaeae nov. sp., Westendorp and 

 Wallays, Herb. Crypt. Fasc. 5: 225. (On decaying turnips 

 which had been stored in a cave.) 



American material: Hyphal stages on numerous hosts, 

 many of which are mentioned in this paper, also others not 

 included ; sclerotia, on potatoes grown throughout the eastern 

 and central United States, on potato stems (New York, 1900), 

 on bean pods (New York, 1910), also on carnation stems, let- 

 tuce leaves, etc. Corticium stage from Prof. F. H. Rolfs, 

 Colorado, 1901, on potato stems; from Dr. I. C. Jagger, 

 Rochester, New York, 1914, on potato stems and on crown 

 of carrot; from herbarium of Prof. E. A Burt, material on 

 moist soil and decayed wood, collected by Prof. Farlow, Mag- 

 nolia, Mass., 1903; from Herb. Mo. Bot. Garden, Nos. 44679, 

 44681, and 44682; collected by Dr. Geo. L. Peltier, Urbana, 111., 



1915. 



European material : Sclerotia on potato tubers from Prof. 



