300 DopDGE: STUDIES IN GENUS GYMNOSPORANGIUM 
Explanation of plate 8 
_ The photographs of spores were made from sori used in making the inoculations 
reported in TABLE VI. Magnification, about 350. 
GYMNOSPORANGIUM TRANSFORMANS 
Fic. 1. A typical spore of this species showing a germ pore at the apex of each 
cell. He cell wall is comparatively thick. 
Fic. 2. A three-celled spore, the lower cell showing two germ pores near the 
septum. 
Fic. 3. A bcuseae! long PPO of the type that is difficult to distinguish 
from such spores of G. fra in Fic. 7. The germ pore at the apex 
of the terminal cell, ‘ase own in Fic. 3, appears to be a very Scasislidkd feature. 
Spores of G. Pesce frequently germinate at the apex but the germ pore is not 
eect mar 
eS rae spores comparatively short. Both cells of three of them have 
ae germinated. 
1G. 5. A group of very thin-walled spores shaped very much like spores of G. 
fraternum. The three-celled nai: Kae is easily oT by its shape from 
the baie spores of G. bi in Fic. 
6. Large, broad, dark SREES spores, none of ‘ohh has germinated. 
GYMNOSPORANGIUM FRATERNUM 
. 7. Spores from a dark brown sorus. The spore wall of the upper cell is 
acs aes at the a 
Fic. 8. Spores from a fn Se sorus. The pore at the apex 
of the upper cell is visible in one of t 
thi 
“ 
The spore walls are very 
GYMNOSPORANGIUM BISEPTATUM 
F om ah £. +h 
FIG. 9. 1 mentioned in another paper 
(Dodge, 4). This i is the youngest infection I have been able to find in nature. 
spores have from four to seven cells. There are very few three-celled spores. 
Fic. 10. Spores from a sorus on a large burl about eight inches in length and 
two inches in diameter. Nearly every spore is three-celled. 
