SAME (AFTER TULASNE). “ILLUSTRATING THE EFFECTS OF THE DISEASE, 
sf See * [Figs. 15, 16, and 17 represent the objects magnified about 460 times; all 0 
"i natural size. | x 
ose . Fie. 1. Portion of a smutty ear of white corn; at the base are some scant arid © ripe 
eas grains (g); above, the female flowers remain sterile (s), and the bra 
aan ' merely cover the abortive ovaries; the bodies (¢ ¢) are bracts made numer 
ae ous by the inflvence of the Ustilago, which is there developed. RF 
_ Fig. 2. Young ovary inclosed by bracts and, like them, swollen by the presence © 
. the endophyte; the style is strongly bent down on the inner sidé. — ro 
Fie. 8. Vertical section of these organs; the wall of the ovary is very thick on the 
oe 
ay 
* 
es 
r 
3s 2. ; outer side and thin on the inner; a rudiment of the ovule is situated at 
ASS the base; the black spots in the thickness of the bracts and the wail of ~ 
Sa the ovary indicate the formation at these points of the black powder ol ae 
(tas the Ustilago. aS 
f oes Fic. 4, Another smutty ovary cut vertically, in which, besides the rudiment of the si 
> ovule, is found a thin membrane, ordinarily not smutty, and which a= 
ae, united below with the inner surface of the ovary. 
ie ‘Fie. 5. A bract or husk deformed and monstrously enlarged by the continued ae ste 
: ee velopment of the smut in its tissue. be 
By - Fra, 6. Transverse section of this bract, in which the presence of the endppheel is 
roy - indicated only in one part, although it occupies uniformly all the tissue 
Be of the organ. 
RS Fie. 7 Another smutty bract. 2 f 
-. « -¥Fic. 8. Transverse section of the same. = 1} eae 
-. ~~ Fig. 9. Another of different form. 7 eK 
eg Fic. 10. Horizontal section of 9. A 
ete Fic. 11. Two smutty bracts partly united. 
i Fig. 12. Transverse section of Fig. 11. Soe. 
.-- ¥ia. 13. Another, more monstrous than the pr eceding a a Pe 
a Fie. 14. Horizontal section of 13 (sketch incomplete). The husks acquire, under — 
ogee the influence of the Ustilago, a much greater development than- the 
=e ovaries, which sometimes fail almost completely. ie 
Fig. 15. Fragment of the mucilaginous material of the Ustilago, in which: are im- 
sie : mersed innumerable spores not yet mature. re yee 
ce Fic. 16. Another fragment in which the spores are less developed than in the pre- 
| ceding ; on one side of this figure are shown filaments such as are abun-- me 
a dant in the cavities occupied by the endophyte. : oe 
__, . Fia. 17. Dry spores. oa" y 
at PLaTE XIV. oe 
ou / ; ee 
oes >> SAME, ILLUSTRATING THE MYCELIUM, ETC. en 
es ‘“ ve 
Fic. 1. Long, extended threads beginning to ramify, running through a pith cell / 
A (in which a nucleus is still to be seen). From the second internode below oR 
a blighted rachis. co 
A long, extended thr ead cover a with a ae A sheath and ge s die 
| 
ie 
re) 
at the DP nottorn of the ovary. ‘ 
. The previous figure at @; a conspicuous piece of thread; in the ti areal i Ise 2 4 
seen the contents; the cellulose sheath is ‘strongly marked, oS 
Fig. 4. Threads which have become distinctly visible in the cellulcse sheath by the 
application of potash and iodine. Shown detached from a cell of the - 4 
: - ovary wall. eS 
- Fic. 5. Thin-walled threads (like the transition form in ‘the spore forming ica 
with many shoots and fine-grained contents. Parenchyma of ovary wall 2 
Ke 
Ae 
iw) 
“Ayes 
it cut lengthwise. 
Me Fic. 6. Thread become gelatinous: the contents is indistinctly seen. Fromagela- 
eee ; tinous spore mass. a 
ee Fia. 7. Spore forming threads, with bright oleaginous contents running between “4 
Ae the cells. Ovary cut lengthwise. td 
Baie i Fie. 8. Gelatinous thread, with a ‘distinct breaking up of the contents for SPO ‘ a 
ae formation ; the upper part represents the same conditions as Fig. 2. Its» 
= course between the cells was still, in part, distinctly perceivable. ai, 
Me 
