DISEASES OF THE QUINCE. 91 
healthy pear leaf, which there germinated, and in two 
weeks produced the brown spots with the black specks in 
the center. In the winter he found on the fallen leaves 
Fig. 62.—MORTHIERA MESPILI, MAGNIFIED Fig, 63.--MYCELIUM OF 
400 DIAMETERS. THE FUNGI MAGNIFIED, 
what he thought to be the same fungus, producing an- 
other set of spores (ascospores), which became ripe in 
April and May. Such fungi are able to grow slowly 
through the winter, ready to spread the disease on the 
new leaves in the spring. He also found the fun- 
gus capable of wintering on the bud-scales, without 
entering on a second stage of development. Young 
and weakly trees are more susceptible to its attacks than 
stronger growing trees. The pear and thorn are also 
subject to its attacks. The only sure remedy is to gather 
and destroy the leaves. 
4, YELLOW LEAF Spots (Hendersonia Cydonia, C. 
and E.).—This is another fungus on 
quince leaves, resembling the Morthiera 
mespili, except that the spots on the 
leaves are yellow and produce a thick- 
ening of the leaf, with a development 
on the under side of the spots like the 
bursting of the cluster cups of the Res- 
tilia aurantiaca, only smaller. The 
Fig. 64. 
. ‘ HENDERSONIA CY- 
spores are elliptical, marked with three pownra, waGyirrep 
bars across, dividing them into four 400 DIAMeters. 
