BRITISH HETER(ECIOUS UREDINES. 95 
germanica, nor did he obtain any result with G. fuscum except 
upon Pyrus communis. 
Gymnosporangium clavarieforme, DC. 
In 16 separate experiments in whieh I placed the spores of 
G. clavarigforme on Crategus Oxyacantha, the Restelia was in 
every case produced. Such an unbroken series of successful 
cultures is, to say the least of it, remarkable, for in the ordi- 
nary course of events one expects a certain percentage of failures 
from accidental circumstances. It is evident, however, that this 
Gymnosporangium very readily attacks C. Oxyacantha. On the 
other hand, in 7 cultures with this Gymnosporangium on Pyrus 
communis, only two were successful (Exp. 24 and 344). The 
Restelia thus produced on Pyrus is clearly distinct from that 
known as R. cancellata (from G. fuscum) in the form of its peridia, 
&c. With G. clavarieforme on Pyrus Malus and P. Aucuparia, 
in the limited number of cultures made, no result was obtained. 
The converse culture of the Restelia on Juniperus communis 
is one that does not seem to have been often made, or, if made, 
the results are unrecorded. Hence the details of my experi- 
ments are appended. Eu 
Exp. 410. A small seedling Juniper, about an inch in height 
and one year old, was on the 25th June, 1884, freely infected 
with the spores of Restelia lacerata. On 1st July it was evident 
that the infection had been successful from the fact that a 
number of the leaves of the Juniper were turned yellow in 
places. These leaves during the autumn fell off. During 
the following year (1885) the base of the stem began to swell ; 
to such an extent did this swelling of the stem go, that the 
plant was killed by it during the winter of 1885-86. — 
Exp. 411. Two healthy Junipers about a foot high were 
planted side by side in 1883. They showed no sign of being 
affected with the Gymnosporangium. On 25th June, 1884, one of 
them was infected freely with the spores of E. lacerata, the other 
being covered by a large bell-glass to prevent accidental inocula- 
tion. On the 8th July many of the younger leaves began to 
turn yellow; these during the summer and autumn fell off ; 80 
that in the spring and summer of the following year (1885) the 
infected plant had such a peculiar habit of growth that a casual 
Observer could not fail to notice the contrast between it and the 
control plant. In December 1885 the bare places on the branches 
