50 BOTANICAL GAZETTE [JULY 
from which in the course of a few months the 
bark sloughs off, leaving an ugly wound 
which requires several years to heal. When 
these wounds are at all numerous the branches 
are exceedingly rough and disfigured, and 
are also greatly weakened. 
Early in June the first acervuli were 
observed. ‘They appeared as small conical 
elevations of the epidermis, and were scat- 
tered irregularly over the diseased area. By 
the end of June these elevations had increased 
considerably in size, and in a few instances 
the overlying epidermis had been ruptured s0 
as to expose the cream colored conidial mass. 
Material collected at that time and taken by 
me to Cornell University, where it was exam- 
ined about the middle of July, revealed the 
presence of a few conidia, none of which, 
however, could be induced to germinate. In 
material which was collected in July, but which 
was not examined until early in October, the 
conidia were more abundant, but in dilution 
cultures in potato-agar only two spores were 
observed to germinate. However, material | 
which was collected at Corvallis, October 4; _ 
and which reached me a week later, had 
developed numerous conidia which germi- 
nated readily both in water and in nutrient 
agar cultures. It would appear, therefore, 
that although evidences of the formation of 
acervuli may be noted early in June, mature 
conidia are not present in quantity befor — 
August or September. | 
Sections through a mature acervulus 
(jig. 8) show a subepidermal stroma from 
which arise comparatively long closely co™ 
pacted basidia, on which the elliptical curved 
conidia are borne. As growth proceeds the 
overlying epidermis is ruptured and ¢ 
Saki SAN OE a ae a 
