REED: SPECIALIZATION OF PARASITIC FUNGI 33 
4. Aecidial stage on Ranunculus silvaticus (Uromyces silvatict-dactylidis 
Krieg.). 
5. Aecidial stage on Ranunculus acer and R. polyanthemos. 
Juel (73) distinguishes several forms in Uromyces Poae: 
1. Ficariae-nemoralis on Ranunculus Ficaria and Poa nemoralis. 
. Ficariae-trivialis on Ranunculus Ficaria and Poa nemoralis and 
P. palustris. 
Ficariae-pratensis on Ranunculus Ficaria and Poa pratensis. 
4. Repentis-nemoralis on Ranunculus repens and R. bulbosus and Poa 
nemoralts. 
5. Repentis-trivialis on Ranunculus repens and Poa trivialis and P. 
annua. 
6. Auricomi-pratensis on Ranunculus auricomus and Poa pratensis and 
P. nemoralis. 
. Cassubici-pratensis on Ranunculus cassubicus and Poa pratensis. 
. Repentis-pratensis on Ranunculus repens and Poa pratensis. 
. Bullati-bulbosae on Ranunculus bullatus and Poa bulbosa. 
Uromyces Fabae (Pers.) de Bary. Jordi (70, 71) has distinguished 
the following specialized races on this autoecious rust which is recorded 
as occurring on species of Lathyrus, Lens, Pisum, and Vicia: 
1. On Lathyrus vernus and probably on Pisum sativum. 
2. On Vicia Faba and Pisum sativum. 
3. On Vicia cracca, V. hirsuta and Pisum sativum. 
It should be noted that Piswm sativum is listed as a host for all 
three specialized races. 
Uromyces Geranii (DC.) Otth and Wartm., and U. Kabatianus 
Bubak. The first mentioned species is reported as occurring on a 
large number of different species of Geranium, while the second men- 
tioned has been reported only on Geranium pyrenaicum. Bubak (23) 
has called attention to minor morphological differences between the 
two rusts. 
Bock (19) carried out tests with uredospores of Uromyces geranit 
from Geranium silvaticum and was able to infect sixteen species while 
thirteen gave negative results. Jacob (66, 67) also conducted experi- 
ments with the rust, using teleutospores from Geranium silvaticum and 
aecidiospores produced from the teleutosporic inoculation. A con- 
siderable number of species of Geranium were successfully infected. 
A few gave negative results. Jacob also used teleutospores of Uro- 
myces Kabatianus from Geranium pyrenaicum and found that this 
rust could also be transferred to a considerable number of other species 
of Geranium. The host range of the two rusts is very similar and the 
differences between the two depend upon minor structural differences 
and not on host relations. 
iS) 
2 
XO Co SI 
