[Vol. 2 



448 ANNALS OF THE MISSOURI BOTANICAL GARDEN 



4. The types of disease induced are most diverse, damp- 

 ing off and root and stem rots being the most important direct 

 effects. Secondary effects have been studied only in a few 

 localities. 



5. The mycelium and the sclerotia, as well as the general 

 appearance on the host, readily distinguish the fungus from 

 Rhizoctonia Crocorum (Pers.) DC. 



6. The organism is readily culturable by the usual labora- 

 tory methods. 



7. The evidence seems clear that the perfect stage of this 

 organism is Corticium vagum B. & C. 



It is to be regretted that the fungus causing a disease of 

 rhubarb (Duggar and SteAvart, '01) was lost before adequate 

 study could be bestowed upon it. The fungus bore a close 

 resemblance to Rhizoctonia, but the aerial hyphal cells were 

 shorter and of greater diameter than those of R. Solani. No 

 sclerotia were found on the host, and they did not develop in 

 culture. 



Shaw (*13) has contributed interesting notes on diseases 

 of plants in India attributed to two species of Rhizoctonia. 

 Unfortunately, however, he has added to the general con- 

 tusion regarding this subject by a preliminary discussion 

 which does not sufficiently designate the forms referred to, 

 but more especially by the advancement of certain ideas re- 

 srardine: species which are made, apparently, without adequate 



conclu 



knowl 



study of material from other countries. The 

 rived at are necessarily at variance with our _ 

 edge of the forms of Rhizoctonia. 



Of the organisms producing diseases in Indian crops he 

 refers to Rhizoctonia Solani Kiihn, a fungus which he found 

 on jute, mulberry, cotton, groundnut, and cowpea. The mode 

 of branching of young hyphae of his fungus is characteristic 

 of R. Solani, but with this the resemblance apparently ceases. 

 Basing an opinion wholly upon his descriptions and figures, 

 the adult mycelium (Shaw, '13, pi. 7 and 8) differs from R. 

 Solani (1) in being usually much finer; (2) in the abundant 

 development of short " barrel-shaped" cells in the ordinary 



