206 BOTANICAL GAZETTE [OCTOBER 
it has received before it can justly be described as a distinct species. 
The manner in which the races reacted in combinations first 
suggested that another species was included in the collections, and 
a later inspection and microscopic examination showed that species 
TABLE V 
SUMMARY OF TESTS OF Cunninghamella echinulata: RELATIVE STRENGTH OF ZYGOSPORE 
TION IN DIFFERENT COMBINATIONS INDICATED BY LETTERS A TO D 
ABSENCE OF ZYGOSPORES INDICATED BY O; GRADES ASSIGNED TO INDIVIDUAL 
RACES ARE MEANS OF THEIR REACTIONS WITH TESTERS OF OPPOSITE SEX; CON- 
TRASTS BETWEEN RACES OF SAME SEX MADE BUT NOT REPRESENTED; IN ALL 
CASES THEY FAILED TO PRODUCE ZYGOSPORES; NO. 362 NUTRIENT USED, CON- 
SISTING OF 2 PER CENT AGAR, 2 PER CENT WHEY POWDER, AND I PER CENT 
Grade 
2.50") 3295 1 3587) 2 04 | 2.03 | 280 1285 1.2025) bits: [0.50 
Grade Minus races 
Plus races 
747 885 527 229 525 238 236 255 248 528 
2.70 | 886. B B B B B C B B KS Cc 
2.90 4 86865. oles: C c C C B c Cc B B C 
4.00 | Yeo. Ce a, C B B A O B B D D oO 
¥700 | 516.4. 3- 2 t B B B C c Be O D O O 
Psa 690-0 6. B 2 C C 1@) Cc e 0 C O 
r.10 | §26. it B oO O B O O & D O 
Be | ee LS © C oO O D Os 0 O O 
0.50 | 250. B O O O Cc O O O O O 
A could be distinguished from the other species. Six races were 
used as testers, and in all 297 contrast combinations were made 
with the total fifty-three races. Of these, twenty-two were plus, 
twenty-nine were minus, and two, on account of their failure to 
show reactions in any of the combinations tested, were listed as 
neutrals. Imperfect sexual reactions, indicated by small letters in 
table VI, will be discussed under the following species. 
CUNNINGHAMELLA BERTHOLLETIAE 
Table VII A shows the tests with C. bertholletiae. Fifteen races 
were used as testers, and in all 12r5 combinations were made with 
the total eighty-nine races. Of these, twelve were plus, sixty-nine 
were minus, and eight, on account of their failure to show reactions 
