Bailey . — Puccinia malvacearum and the Mycoplasm Theory . 199 
Series V. (May-Jime 1919.) 
Two leaves from a plant of Malva sylvestris growing next to the one 
employed in Series IV. Leaves treated as in Series IV. 
Leaf C. 
Moderately heavy infection. 
Results. 
Submerged portion. 
12 pustules examined. 6 germinated well, but for most part 
produced barren tubes intermediate 
between the two forms. A few oidia 
were produced, but no spqridia. 
2 germinated rather poorly, producing 
a fair number of oidia, the rest being 
as above. 
3 germinated poorly, producing mostly 
barren tubes as above, and also a few 
sporidia. 
i germinated fairly well, producing 
mostly sporidia. 
Exposed portion. 
1 2 pustules examined. 4 germinated well ; the rest badly. 
Sporidia only were found in every case. 
Leaf D. 
Lightly infected leaf. 
Submerged portion . 
10 pustules examined. 2 germinated well, forming oidia only. 
i germinated well ; mostly oidia, but 
a few sporidia also. 
1 germinated moderately well, giving 
a few oidia and sporidia and a lot of 
barren abortive tubes. 
4 germinated poorly, producing mostly 
abortive tubes, and occasionally oidia 
or sporidia. 
2 failed to germinate. 
Exposed portion . 
10 pustules examined. 8 germinated well and 2 poorly. 
Exclusively sporidial. 
* Pairs or series of leaves taken from single plants. Some of these leaves 
were totally submerged ; others were exposed to moist air. 
The others entirely exposed to moist air. 
Leaf. Description. Treatment. 
E. Five yellow cushions representing Submerged, 
pustules not yet broken through. 
From a hollyhock plant growing 
in outside border and showing 
slight infection. 
E. 1. About a dozen very young pus- Exposed, 
tules. 
From the same plant as leaf E. 
Results. 
Leaf began to decompose before 
pustules matured. 
7 pustules examined. Germination 
good. Sporidia only. 
F. 
About 50 pustules, chiefly col- Submerged, 
lected in one corner. Of these, 
7 had just broken through and 
were marked with Indian ink. 
From naturally infected plant of 
Malva sylvestris growing in 
the open. 
Leaf began to decompose before 
marked pustules germinated. 
5 of the other pustules examined. 
Germination poor, but oidial only. 
