ore SAS 
Liat pete its Th ; S : 
“REPORT OF THE © Sondoneinenas "0 Sh 
GA’? The as on tiie leaf stalles and shoots are san ieee 
those on the leaves. They are elongated in the direction of growt 
: (one-half inch sometimes), and are surrounded by the broken. ed: 
of the ruptured cuticle. The action of the parasite often incites : 
_ excessive cell development in the tissues of the host, in consequence 
of which the shoots are found more or less bent away from the pointe 
of attack (Fig. 1, a). we 
If we examine thé rose leaves closely about mid-summer we will + 
find that the orange-yellow spots have been replaced (to all appear- 
ances) by spots of a brick-red color, and later in the season another 
and more ARS change occurs; the under surfaces of the dis 
eased leaves then are seen to be more or less thickly sprinkled with 
Ze black, hair-like tufts. ieieavoma: the brick. red stage — 
(c) BOTANICAL CHARACTERS. 
With these spores, usually surrounding each group or Aires are = 
, peculiar club-shaped growths termed par raphyses (Fig. 3, aa). mary 
aia In the second or uredo-stage the spores are mec in shape and 
: size to the eeidiospores, but they have their outer surface finely 
roughened and they are grouped differently (Plate X, Figs. 3 and 4), 
<2 Surrounding each collection of these spores the same club- shaped 
-- bodies observed in the ecidio-stage occur. These are sterile organs 
of doubtful function, which accompany the spores of many fungi, 
es In the present instance they have obtuse club-shaped tips andare _ 
is somewhat incurved and form a sort of cup around thespore masses.* 
me The spores in this second or uredo-stage are borne on short pedi- 
cels and otherwise differ from the eecidiospores in having their. — 
Say A microscopical examination of the early or orange stage of the © 
-_._. disease will show us that the pustules are made up of an immense 
-. number of globose or angular bodies arranged in compact cern : 
_» rows or chains (Plate x Fig. 3). The formation of these bodies — 33 
begins at a point some distance beneath the cuticle, and it is by their — 
< growth that the latter is finally ruptured. This period of develops 
res ment is known as the ecidic-stage of the parasite, and the angular 
a or rounded bodies referred to are the ecidiospores. These have an ae 
- average diameter of from 18 to 22y (1u=sg5o=inch), and, like the 
sae seeds of higher plants, they serve to spread and propagate the fungus, ae 
re 
outer surface rou ghened (Pig. 4). Bei 
The spores in the third or last stage are very markedly different 
from those preceding. They appear, when magnified, as illustrated 
| in Plate X, Fig. 7. A more highly magnified figure of one of these 
en spores is shown in Plate IX, Fig. 5. They are very dark colored, 
roughened, cylindrical bodies, about 254 in diameter and 604 te 754 
ate long, divided by septa into from 5 to 11 cells and abruptly termi- 
ig nated by a short, colorless point. The stalks supporting them are — 
. comparatively short, colorless,’and considerably enlarged or swollen — 
towards the base. The same colorless paraphyses accompany this 
; stage as were seen in the two preceding, 3 
nA The ecidio and uredospores germinate readily, under favorable 
conditions, as soon as they reach maturity; but when kept diy for a 
* The uredo-stage of this fungus has recived several names by the older mycolo- | aber 
gists, among them Uredo miniata, Pers., and Coleosporium miniatum, Lev, 
