[Vor. 8 
8 ANNALS OF THE MISSOURI BOTANICAL GARDEN 
bark of the plant, especially near the ground, was much injured 
and easily peeled from the stem. A net-work of fungous threads 
was abundantly seen on the inside of the bark. 
D, obtained from a dahlia plant in the garden just mentioned. 
The plant was perfectly dry and the bark of the plant was very 
easily removed from the stem. To my great regret I lost the 
strain during the progress of this study, so that in the present 
paper I am unable to report any extended result with it. But 
from the preliminary experimental work done by me during my 
stay at the University of California, it seems safe to say that it is 
identical with P7. 
Fig. 1. a, sclerotial and hyphal cells of P1; b, sclerotial and hyphal cells of P4 
(camera lucida drawings). 
B3, isolated from the Corticium stage found on the stems of 
rather healthy lima beans grown in the Missouri Botanical 
Garden, 1918. The affected plants appeared practically healthy, 
having many pods. The Corticium stage was also observed on 
the pods, or leaves, and even on small areas of the soil adjoining 
the plants. 
The account of Corticium as a perfect stage of Rhizoctonia 
Solani was first recorded by Rolfs (03), and subsequently (704) 
a more detailed description was published by the same author. 
The fruiting stage found by him was more or less related to 
Corticium vagum B. & C., but its apparent parasitic mode of 
life and the size and shape of spores were considered of sufficient 
importance to establish it as a new variety, and it was designated 
Corticium vagum B. & C. var. Solani Burt. However, Burt 
