98 
UROMYCES 
part of the world; reported on many Leguminose, but doubtless some of 
these are distinct species. Jordi has distinguished under U. Fabae three 
Fig, U. Fabae. 
yo YP 
Teleutospores 
a ae oe on Vicia Cracca. 
“biological” races-—( 
Fig. 51. U. Fabae. Telento- 
spores and uredospore on 
Vicia sepium. 
1) on Faba vulgaris and Pisum sativum, (2) on 
Lathyrus vernus and probably also on Pisum sativum, (3) on Vieta Cracca, 
Pisum sativum, and possibly also Vicia hirsuta. 
The ecidial generation is frequent on some hosts, such as eva sepium 
Fig. 52. U. Fabae. 
Ecidia on Pea, from 
Plowright’s culture, 
iu which he produced 
them on both Pea 
and Bean from the 
same teleutospores. 
and species of Lathyrus. On Faba vulgaris aud 
Pisum sativum it is, on the contrary, very rare, 
being recorded by Sydow, on the Pea, only from 
Norway, East Indies and Japan (once from each). 
It has been seen on the Bean in the East Indies, but 
seems to be not uncommon in artificial cultures, 
in which Plowright produced it both on Pea and 
Bean from the same teleutospores (Plowr. Ured. 
p. 121). 
On the leaves of the common field Bean only 
the uredospores are generally to be found, even as 
late as mid-October, but on the stems the teleuto- 
spores form large black sori. On Vicia sepium 
the uredo-sori are often darker and covered by the 
epidermis for a shorter time than on the Bean, 
while the teleuto-sori occur in great abundance on the leaves and even 
on the tendrils. 
If all the infected 
haulm, etc., were burnt instead of being put on the 
manure heap or left to rot on the ground, the disease would become less 
prevalent, especially if Jordi’s idea is true, that the Rust on the wild 
Vetches is a distinct biological race. In Ecuador, at Quito, which has a 
very equable climate 
of “perpetual spring,” U. Fabae has, according to 
Lagerheim, become almost an isolated uredo. The same thing is true of 
it in other tropival climes. 
DISTRIBUTION : 
world-wide. 
