[VoL. 8 
20 ANNALS OF THE MISSOURI BOTANICAL GARDEN 
mycelium is Rhizoetonia-like rather than Ozonium-like, yet no 
sclerotia have been found. In this connection I may add 
that it is proposed in a later paper to bring together certain 
observations which have been accumulating on Ozonium 
stages of Basidiomycetes. 
Numerous germination cultures have been made with ma- 
terial from two weeks to three months old. While this has af- 
forded some interesting suggestions, germination in any par- 
ticular medium has been, on the whole, erratic. The data are 
.4. Phymatotrichum omnivorum: acicular hyphae exhibiting charac- 
teristic modes of branching. 
reserved for a later report. The cultures which have been 
prepared from the newly infected root, as also those from 
erratic spore germination, have yielded a sterile mycelium 
which, while in itself distinctive, resembles only in a general 
way the mycelium found on the roots and in the soil. The 
mycelium in culture is hyaline, forming on young bean stems 
and on various other culture media a dense, slow-growing 
mat, seldom rising more than 3 mm. above the substratum, 
and never becoming fluffy in appearance. After standing 
for some weeks this mycelium becomes somewhat colored, as- 
suming a warm buff to light ochraceous buff. In culture the 
