48 
differences which have unavoidably made themselves apparent in the 
metabolic processes.” 
Professor Ward was not able to establish the connection of this fun¬ 
gus with any other form, but believes it to be the conidial state of some 
Peziza , of which there would seem to be little doubt.— Erwin F. Smith* 
EXPLANATION OF PLATES. 
Plate I. 
Figs. 1-11. Tilletia buchloeana, Kell. & Sw. on Buchloe dactgloides. 
1-4. Affected ovaries of various sizes, x 6. 
5. A spore showing sub-reticulate markings, and pedicel of attachment (?) 
x 500. 
C. Spore showing unusually prominent spines and two layers of the hyaline 
envelope, x 500. 
7. An optical section of an immature spore showing the two layers of the 
hyaline coat; the inner extending from the wall to the tips of the 
spines; the outer spinose and inner lighter thinner wall; the granular 
layer, and the collapsed center, x 500. 
8-10. Optical sections of mature spores showing but one hyaline layer; Fig. 
9 shows the rudiment of the pedicel of attachment (?), x 500. 
11. A male spikelet consisting of three flowers all bearing ovaries which 
are filled with the mass of spores. 
Figs. 12-25, Ustilago Andropogonis , Kell, and Sw. on Andropogon pro- 
vincialis (Figs. 12-18 on A. provincialis) and A. Hallii, Hack. 
12-14. Affected ovaries of various sizes, x 3. 
15. A portion of the rachis showing a normal sessile, and a pedicelledflower, 
also an extra short pedicelled one which (like the sessile one) bears an 
infested ovary, x 3. 
16. A portion of the rachis bearing normal flowers, the sessile pistillate and 
affected, the pedicelled one staminate and free from the disease. 
17. Two spores of Ustilago andropogonis from A. provincialis seen in optical 
section showing spines, thickness of cell-wall, and granular contents, 
x 500. 
18. Three spores of same showing common sizes and shapes, x 500. 
(Figs. 19-25, Andropogon Hallii.) 
19-22. Affected ovaries of various sizes, x 3. 
23. A portion of the rachis bearing sessile (fertile) and pedicelled (normally 
sterile) flowers, both producing smutted ovaries. 
24. Three spores of Ustilago andropogonis from A. Hallii, showing common 
sizes and shapes, x 500. 
25. Two spores seen in optical section showing thickness of cell-wall and 
granular contents, x 500. As will be seen by comparison with Fig. 
17 the spores from A. Hallii had a slightly thicker wall than those from 
A. provincialis. 
Figs. 26-40. Ustilago boutcloiue, Kell. & Sw.on Boutcloua oligostaclnja. 
26-28. Affected ovaries of various sizes, x 6. 
29. An affected spikelet distended and the palet split by the enlarged smutted 
ovary, x 6. 
30. Six spores showing common sizes and shapes, x 500. 
