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_ SECTION OF VEGETABLE PATHOLOGY. = © 3895. 
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eo} Prate IX, 
R ‘BLACK SPOT ON ROSH LEAVES (AOTINONEMA ROS#)—ROSE PHRAGMIDIUM (PHRAG- 
a , MIDIUM SPECIOSUM). 
/ 
., Fia. 1. Section through healthy rose leaf: a, cuticle of upper surface: b, upper 
lower epidermis; f, cuticle of lower surface. All except the epidermal 
eM cells are partly filled with chlorophyll bodies. (B®. A. §., del.) 
Fig. 2. Section through rose leaf attacked by Actinonema, showing an early stage 
ae of the djsease. The upper epidermal cells are partly filled with a dark, 
Sty - homogeneous mass, consisting of the transformed cell contents; the chlo- 
Ay ’ yophyll bodies in the upper row of palisade cells are disorganized, and the 
eS process of disorganization has begun in the lower row; @ shows the hyphae 
3 betw¢en the cuticle and the epidermis; 6, cuticle that has been ruptured 
Pt) - by the formation of spores beneath; c, spores borne on an indistinct-mass 
at of mycelium; d, the mycelium can be seen in the cells of the upper epi- 
dermis, and evidently pushes into or between the palisade cells, although 
it can not be distinguished below the epidermis. (B. A. 8., del.) 
Fig. 3. Very advanced stage of the same. The disorganization of cell contents has 
progressed through the leaf, and the cells are shrunken so as to show the . 
mycelium between them. Mostof the spores have escaped from the fruit- 
{ ing pustule. (H. A.S., del.) - 
 _ Fie, 4. Spores of same, mach enlarged. (HE. A.S., del.) f 
Fig. 5. Teleutospore of Phragmidium mucronatum, showing long stalk thickened 
: towards the base. (F.L.S., del.) 
Fia. 6. Fragment of rose stem affected by Phragmidium speciosum. (R. ©., del.) 
Fic. 7. Teleutospores of P. speciosum. (F.L.8., del.) 
... Fia.8. Same, more enlarged and without pedicel. (F. L.S., del.) 
iy Pratt X, 
ROSE RUST (PHRAGMIDIUM MUCRONATUM). 
Fic. 1. Branch of Rosa blanda, natural size, showing appearance of the disease in 
) ; the Aicidio-stage on the stem and leaves; at a the branch has been bent 
i : from the effects of the fungus. (R. C.,:pinx.) 
; Fie. 2. Leaf attacked by Uredo and Phragmidio-stages; the latter is represented by 
et the darker spots. (R. O., pinx.) 
' Fig. 3. Atcidio-stage. Section through diseased spot occurring on a vein; the spores 
are borne in chains over the back of the vein, and a few paraphyses (a a) 
may be seen at the circumference of the spot. (F.L.8., del.) 
.4. Uredo-stage. Cluster.of spores and paraphyses. (F. L. S., del-) 
Fic. 5. Atcidiospores. (F. L. S., del.) 
6. Uredospores, separated from their pedicels. (F. L. S., del.) 
7. Teleutospores. 
= PLATE Xf. 
POWDERY MILDEW OF GOOSEBERRY (SPH ZROTHECA MORS-UV 4). 
Fia. 1. Mycelium with conidiophores and conidia in rows, as found on the surface 
of the leaf: a, conidiophore; b, conidium. Two conidia are represented 
as having become detached. 
. Three of the so-called “ pycnidia” of the fungus. Two are represented as 
discharging their spores. (After Tulasne.) 
. The male (a) and female (6) cell united for the production of the perithecium. 
. A young perithecium. 
. A perithecium nearly full grown, showing appendages. 
. Ripe perithecium broken open and the spore sac (ascus) coming out. 
. An ascus, showing the eight spores. 
e 
AIRDUP CO . 2” 
PLATE XII. 
SMUT OF INDIAN CORN (USTILAGO ZHA-MAIZE). 
Fie. From photograph, illustrating the appearance of the disease in the ear (@) and 
; on the stalk (0), 
epidermal cells; ~c, two rows of palisade cells; d, loose parenchyma; e, | 
