80 Wisconsin Academy of Sciences, Arts, and Letters. 
Fig. 3. 
Fig. 4. 
Fig. 5. 
Fig. 6. 
Fig. 7. 
Fig. 8. 
Fig. 9. 
Fig. 10. 
Fig. 11. 
Fig. 12. 
Fig. 13. 
x 606. 
x 340. 
x 340. 
x 340. 
x 340. 
x 340. 
x 685. 
x 685. 
x 480. 
x 1525 
x 1175. 
x 2285. 
Portion of an uredospore sorus. The four 
large cells at the bottom are the growing 
cells from which cells are cut off above. 
The second of these cells from the right 
is in normal growing condition with the 
nuclei lying longitudinally in the axis of 
of the cell. The cell on the left has the 
nuclei revolved to a horizontal position 
and is ready for conjugate nuclear di¬ 
vision. In the cell on the right, nuclear 
division has taken place and is about to 
be followed by cell division. In the sec¬ 
ond cell from the left nuclear and cell 
division are complete and nuclear division 
has again occurred in the upper cell and 
a sterile cell is about to be cut off from 
the lower part of this upper cell. Be¬ 
neath the top row of cells the sterile cells 
have disappeared. 
Teleutospore. 
Promycelium. 
Two celled stage of the promycelium. 
Four celled stage of the promycelium. 
One of the divisions of the four celled stage 
forming a sterigma. 
A uninucleated sporidium. 
A binucleated sporidium. Auclei close to¬ 
gether. 
A normal binucleated sporidium. 
Teleutospore nuclei ready for fusion. The 
dark extra nuclear body is uniformly 
present at this stage. 
Early stage of fusion. 
Later stage of fusion. 
