Mar. 1, 1925 
Life History of the Texas Root Rot Fungus 
477 
short terminal or lateral branches of 
the hyphae or on the sides of the undif¬ 
ferentiated hyphae, pale ochraceous to 
gray in mass, appearing nearly colorless 
when separate, globose to ovoid 4 to 
6X5 to 8 smooth. 
Sterile mycelial stage (Ozonium 
omnivorum) mycelium thin, floccose to 
arachnoid, forming thin branching 
strands, the dirty ochraceous branches 
This plant has something of the gen¬ 
eral appearance of some of the yellow 
resupinate species of Hydnum which 
have been described, but appears to be 
distinct, especially in its parasitic habit 
and apparent restriction to the south¬ 
western United States and Mexico, the 
only region where this root rot is known. 
The perfect stage probably occurs as a 
saprophyte also, as specimens very sim- 
Fig. 2 .—Hydnum omnivorum: Ozonium stage, showing characteristic modes of branching of the terminal. 
hyphae. X 420 
arising from these strands are thin, 
somewhat rigid and branch at right- 
angles from ’somewhat swollen nodes, 
2 to 4 branches from a node, usually 
long, thin, tapering and acute (fig. 2). 
Type No. 5267 C. L. S. on wilting 
Maclura aurantiaca near Paris, Tex., 
September, 1903. In herbarium path¬ 
ological collections, Bureau of Plant 
Industry, U. S. Department of Agri¬ 
culture. 
ilar, if not identical, have been found 
on old over-wintered cotton stalks 
killed by the root rot. 
Unfortunately the character of the 
basidiospores can not be given, as none 
could be found on the specimen de¬ 
scribed. The enlarged spines in the 
plate had the tips broken off in most 
instances. When whole they are acute, 
as indicated in a few cases. The color 
in fresh specimens is brighter than in 
the dried, as it fades in drying. 
