DopGE: STUDIES IN GENUS GYMNOSPORANGIUM 297 
To prove that the species were distinct, spores from individual 
sori were germinated and smeared on selected leaves of both 
Amelanchier and Aronia. Slide mounts of the spores were then 
preserved and photographed. A few of the photographs are 
shown in PLATE 8. TABLE VI, A and B, is arranged to show the 
effect of inoculating both trial hosts with spores from the same 
sorus. 
TABLE VI 
PARALLEL INOCULATIONS OF Amelanchier AND Aronia WITH INDIVIDUAL SORI FROM 
LEAVES OF Chamaecyparis, 1916 
A. G. fraternum 
Date Amelanchier Result 1 Aronia Result | Source of sorus 
| 
Feb. 22 491 = | 642 — 435-3" 
Ap. 18 558 + 806 _ 721 
Ap. 18 556 ~ 808 - 721.10 
Ap. 18 651 - 809 — 9721.5 
Ap. 18 807 + 344 _ 721.8 
Ap. 18 810 _— 256 — 721.4 
Ap. 18 485 + 250 _ 7AItt 
Ap. 20 820 + 818 _ 721.3 
Ap. 20 554 + 819 = 721.2 
p- 20 821 Be 822 7at7 
May 8 864 + 456 _ 740.1 
ay 8 484 7 470 746.2 
B. G. transformans 
Feb. 22 441 aes 465 “ 435.2 
Feb. 26 438c 452 + 423.1 
Feb. 22 503 643 wt 435.2 
Feb. 26 552 a 452 me 423.2 
I 553 - 454 7 424.2 
Mch. 7 649 an 518 a 400.2 
Mch. 3 4304 oe 645 = 424.1 
Ap. 27 653 ae 457 + 701.0 
Ap 9 653 = 652 ri 437-1 
7 651 - 650 - 437-2 
My. 10 654 _ 808 + 710.1 
My. 17 800 = 806 738.1 
Referring to the table it can be seen under “A”’ that G. frater- 
num infected nine of the twelve amelanchiers inoculated, while the 
aronias were not infected. Under ‘“‘B” where the thicker-walled 
teleutospores, G. transformans, were used seven Aronias were 
infected, five gave no results, and none of the amelanchiers was 
infected. In addition to the cultures shown in the table, 32 
amelanchiers have been heavily infected by spraying with care- 
- Means that the sorus used was sorus No. 3 from plant No. 435. 
