1887] Botany. III5 
to li eA 
= = S activity of the chlorophyll may be lessened in 
M y oy a change in the position of the infested stems 
and rigid Ho aA PRESES effect of a parasite is a more erect 
E o > an , as in blackberries diseased with Ceæoma nitens, 
and E id i and in the garden spurges, Euphorbia maculata 
Morir g4 oe infested with the cluster-cup, Æcidium eu- 
Re reading. urges normally grow prostrate, with leaves 
sunlight, I ing, allowing the greatest possible exposure to 
. In the diseased condition the stems are erect and the 
lerated or retarded, and 
bot 
both these effects may be produced in different cases by the same 
n Be 
gus. Peronospora parasitica growing upon the commo 
felted coating of 
-latte 
oa e be somewhat contracted. The same tungus growing 
e stems of Sisymbrium canescens causes swelling and 
istorts the 
and the stem bent. 
0 di; eos ; i i 
Exobasidium vaccinii on species of Vaccinium causes the leaves 
to shrink - ‘ 
shrink ; forms believéd to belong to the same species, growing 
d sacs, often several 
chlorophyll-bearing parts of 
ts; woody stems, roots, flowers, See» and fleshy fruits a 
: -Aave their parasites. One of the i eed 
cetes, 
-root in the roots of 
club-root of roses, which is 
La, causes the disease call 
e. The appearance of the 
