GYMNOSPORANGIUM CLAVARIZFORME 
wigmata, much in the same way in which the basidiospores 
> thrown off in the Agaricini. They accumulate in large 
mbers on the outside of the mucilaginous mass, and present 
> appearance of a golden-yellow powder. The mycelium of 
2 fungus is perennial in the Juniper, spreading from branch 
branch and producing a fresh crop of teleutospores each spring. 
If one of the basidiospores is blown by the wind or carried 
insects to a moist leaf or young fruit or stem of Hawthorn, 
germinates and bores through the cuticle in the ordinary 
y, and forms there a limited patch of mycelium. It is said 
at the infection has been known to be conveyed for half 
~Ss. 
31. Gymnosporangium clavariaeforme. Aicidia on leaf, fruit, and branch 
of Hawthorn (reduced); wu, peridium, x16. The fruit and gall on branch 
are shown as they appear when the peridia are old, aud the mass looks 
somewhat like » honeycomb. 
mile. This mycelium produces the ecidium-stage, which is 
t usually seen until the end of June, in about 18—20 days. 
1e xcidia are not of the ordinary cup-like shape, but of the 
m called Reestelia: they are cylindrical, brown at the base 
d ochreous above where the peridium is torn into numerous 
mder filaments (Fig. 31). On the leaves they appear in 
undish patches a few mm. in diameter, but on the twigs 
ey form large spongy masses and the fruits are often so 
vered with them as to look like a cluster of little spikes. 
* IT am indebted to Professor Buller for calling my attention to this fact. 
