; “is a : : 5. abs eae INT, oe: ees: Bie s A BVA 4 
-. SECTION OF VEGETABLE PATIUOLOGY. + — 
~ => - 
— - ‘ 
‘More transparent spores forming in the interior of the gelatinous thread. 
The same; however, 2 great number of the transparent spores are seen 
lying in a row, lengthwise in the stem. The latter appear more trans- 
5 SEES arent. 
eae WIG. 11, Ke oiark become brownish, surrounded by the gelatinous membrane of the 
+ on ~ thread. From the ovary wall. a 
Fic. 12. a, promycelium with a projection: twenty-four hours; b, spore germina- 
$ ‘tion later with a straight promycelium ; forty-eight hours; c, the same 
st ss with the promycelium bent in a knee form; @, formation of a lateral ; 
ae sporidium (gfter twenty-four hours). Highly magnified. os 
 Fig.13. An affected ovary cut lengthwise; the masses of mpe spores appear as oe. 
black spots or stripes. 
ee ey.: PLATE XV. 
SAME, GERMINATION OF SPORES IN WATER AND NUTRITIVE SOLUTIONS. 
(Figs. 30-35, after Brefeld.) s 
_ Fig.1. Germination of spores in water and bearing conidia. 
_ Fia.2. Older germinating spores. The conidia have fallen, some cells of the con- > 
ies idiophores have become empty, others have developed into filaments. os 
_F1G.3. Germination of spores in a nutritive solution, showing the more strongly 
oe developed conidiophores producing conidia from every cell ; the conidia 
Ki have also sprouted and bear other conidia. 
: Fic.4. Development of a spore cultivated singly in a drop of nutritive fluid: a, 
~ the germinal tube formed; b, same, more fully developed and divided 
At, ~ into cells by cross partitions; c', c, b, fallen pieces; c' and c? have pro- 
: duced conidia, d d, which, fallen from ¢, develop other conidia or yeast- 
a jike forms by continuing budding. 
Fieé.5. Conidia forming filaments in an exhausted nutritive solution: a, thread ery? 
es fullcf protoplasm ; b, filament -partly emptied of protoplasm ; c, conidia 
a germinating while still attached together. 
_. Fie.6. A conidium which in germinating has protruded into air and apparently 
eahC ae fermed aerial conidia. 
_ .. Fie.7. Conidia which did not germinate to form filaments and in which oil glob- 
: ules have appeared ; resembling spore formation. 
PLATe XVI. inl 
INDIAN CORN RUST (PUCCINIA MAYDIS). 
'*’ _¥Fie@.1, Transverse section of corn leaf through a cluster of teleutospores, showing 
also the ruptured epidermis and mycelial filaments among the leaf cells. 
Fic. 2. Uredospores, three viewed in optical sections showing germ pores and thick- 
ness of wall; a fourth showing surface view. 
Fig.3. Teleutospores. wad 
PLATE XVII. 
ERINOSE. 
Fic. 1. Lower surface of leaf attacked by Erinose. (After Corda.) 
Fie. 2. Cross-section of grape leaf through one of the galls of Phytoptus vitis, ) 
showing the hairs (@) formed from prolonged epidermal cells, two of the 
animals (b b), and one of the parthenogenetic eggs (c). (E. A. S., del.) 
7 
