IJn 



MOUl'llOLOiiY AXI) l-AI!.\.srns.M OT ItlllZOC TONlA. 



iireas. Tlic tiisoaso is also known on tin- Govornnic'iit Farm at Lvall- 

 |)ur in tlio Punjab and doubtless occurs to a certain extent wherever 

 jute is grown. 



TextFio. I.— K. solam Klhx X 250. 



The nioij)liological characters of the fungus appear to \aiy with 

 the age of tlie culture. In a sub-culture 24 hours old the hyphae 

 jiresent the apj^earance shown in Text Fig. I. 1 : the branching is 

 abundant, the youiig branches are at fiist bent parallel to the main 

 axis; all show"^ that constriction at the base which is characteristic 

 of Rhizoctonia ; at this stage transverse walls are very few, the wall 

 which separates a branch from its parent hypha is usually about \of 

 from the point of origin of the branch. Thehyphseare about 8 — 9'^ in 

 diameter and the cells from 50-— 150" long. In a culture ten days old 

 the upper surface of the agar is covered with a weft of white hyphso 

 and numerous black sclerotia are embedded in the agar. Under the 

 microscope the aiirial hyphee appear of a blackish colour ; they show the 

 characteristic Rhizcctonia branching (Text Pig. I, 2), and the larger 

 are fro)n 6— 8m in diameter but the majority are very much finer; the 

 sclerotia when mature aj)]jear as dark, l)lack-rounded bodies about 

 100 — 150m in diameter. Jn old cultures huge hyitlia' consisting of 

 (short l;arrel-shaped ceils arc plentiful. 



