200 Bailey . — Puccinia malvacearum and the Mycoplasm Theory . 
Leaf . 
Description. 
Treatment . 
Results. 
F. i. 
20 very young pustules. From 
same plant as F. 
Exposed. 
11 pustules examined. Germination 
mostly good and sporidial only. 
In two cases germination was very 
poor, and the promycelia were 
malformed, but these also produced 
sporidia. 
G. 
About 40 young pustules evenly 
distributed over leaf-surface. 
From plant of Malm sj/lvesiris, 
showing fairly heavy natural 
infection. Plant growing in the 
open. 
Submerged. 
The leaf showed fairly advanced 
decomposition before much ger- 
mination of spores had taken place. 
Those which germinated produced 
oidia. 
G. i. 
Similar leaf from same plant. 
Exposed. 
18 pustules examined. 
Germination good in all cases. 
Sporidia only produced. 
G. 2. 
Two yellow cushions not yet 
broken through the leaf-surface. 
From same plant as leaf G. 
Submerged. 
Leaf decayed before pustules 
matured. 
g. 3 . 
About 20 very young pustules. 
From same plant as G. 
Leaf decayed before majority of pus- 
tules came to maturity. 
5 pustules examined. 
Of these one showed good germina- 
tion and two fair germination. 
Oidia only produced. 
The remaining two germinated badly. 
One of these last produced oidia only ; 
the other a few sporidia as well. 
G. 4. 
About 20 young pustules. 
Leaf from same plant as G. 
Exposed. 
6 pustules examined. All gave good 
germination, except one which 
germinated very badly. 
Sporidia produced in every case. 
G. 5. 
Similar leaf to last. 
From same plant. 
5 pustules examined. 
Germination good. Sporidia only 
produced. 
G. 6. 
20-30 pustules irregularly scat- 
tered over surface. 
From same plant. 
Submerged. 
9 pustules examined. All, except 
one, germinated well. 
5 gave oidia only. 
2 gave a few sporidia in addition to 
the oidia. 
2 produced a large number of oidia, 
a few sporidia, and a fair number 
of germ tubes suggesting abortive 
promycelia. 
G. 7 * 
Similar leaf to last. 
From same plant. 
>> 
5 pustules examined. 
Germination good in each case. 
Oidia only occurred, except in one 
case where a few sporidia also 
appeared. 
G. 8. 
Similar leaf to last. 
From same plant. 
a 
3 pustules examined. 
Oidia only produced. 
