Caknt =: — Brovni Bot of Citrui^. 
27 
of the mean size of eoni<lia gTOAvii on tissue under different eondi- 
tioiisl is small. The average ratio of length to l)rea;Uh is 2.H as 
shov’ii in Table 2 hereunder: — 
No. 
1 
1 
3 
Katio. 
3.4 
2.8 
2.7 
2.6 
10 — 2.0 
6 — 2.4 
15 ~ 2.3 
12 ~ 2.2 
14 — 2.1 
11 - 2.0 
10 — 1.9 
5 — 1.8 
7 — 1.7 
3 — 1.6 
100 ^lean 
Table 2. Ratio of length to breadth of 100 conidia grovn c,n 
lemon leaf fragments on ])otato dextrose agar. 
Tlie majority range from 1.9 to 2..1. The extreme ratios cf 
3.4 and 1.6 to 1.8 are confined to exceptionally large and sinall 
conidia. The average length of the persistent pedicels of the same 
100 conidia was 23.5mmm. (range 2 — 56mmm.) . On the Colocasia leaf 
culture the pedicels averaged 39mmm. (range 10—63). The average 
length of the pedicels of 43 conidia developed in water from potato 
dextrose agar and wheat meal fiiltitres was 39mmm.. Avith a maximum 
lengtli of 54mmm. Tliere is no cellulose plug at tlie point of bisertioii 
of the sooropliore wliich averages 4mmin. in AA'idth at that pobit. 
The conidia germinate with germ, tubes or as zoosporanghi . 
In tlie former case the germ tube usually emerges from one side of 
the papilla, which is- finally aljsorbed. A groAvth of 120mmm. in 24 
hours lias been noted after placing tlie spores in Avater at a tempera- 
ture of niiproximately 12° O. Occasionally a short hypha is pro- 
duced liy a eoiiidium AvliJch Ijecomes terminnted by another but 
smaller conidium. Tliis may be repeated until a chain of three or 
four is formed. At other times the tip of hypha appears to have 
started to form a conidium and then reA'erted to vegetative groAvth 
thus producing SAvellings in its length. Tlie formation of zoospores 
occurs readily Avhen the spores are placed in Avater at a room tetm 
peiatiire of 31 lo°C, though a percentage alAA’ays germinate as 
conidia: At higher temperatures germination as conidia is the 
