C. M. Gibson. 
184 
NOTES ON INFECTION EXPERIMENTS WITH 
VARIOUS UREDINE/E. 
By Miss C. M. Gibson. 
[With Plates V. and VI.] 
T HE infection experiments, the results of which are recorded in 
the first part of this paper, originated in a suggestion made 
by Professor Marshall Ward that I should see what happened if 
any plant, say Ranunculus Ficaria, were inoculated with the 
uredospores of Chrysanthemum-rust. 
Ranunculus Ficaria was chosen as host from the convenience 
of the surface of its leaves for inoculation and from the fact that it 
had large stomata. Uredospores of Chrysanthemum-rust were 
chosen to inoculate with, because a large stock of this rust 
happened to be available at the time. 
The following list summarises the results of suecessful and doubtful cases of 
the entry of the stomata by the germ-tubes of the spores employed : — 
Kind of Spore 
used. 
Species of Fungus. 
Original Host. 
Experimen¬ 
tal Host. 
Result. 
Uredospores 
Uredo 
Chrysanthemum 
R. Ficaria 
enter freely 
Aecidiospores 
Chrysanthemi 
Pliragmidium 
sinense 
Rosa 
yy 
yy 
yy 
Aecidiospores 
rosae-alpinae 
Uromyces Poae 
Ranunculus 
yy 
yy 
yy 
Aecidiospores 
Aecidium Bunii 
repens 
Bunium 
yy 
negative 
Aecidiospores 
Puccinia Poarum 
Tussilago 
Caltha 
enter freely 
Uredospores 
Uromyces Geranii 
Geranium 
yy 
yy 
yy 
Aecidiospores 
Puccinia Menthae 
Mentha 
yy 
enter not 
Uredospores 
Puccinia 
Carduns 
yy 
very freely 
enter freely 
Aecidiospores 
Uredospores 
Pliragmidium 
Sanguisorbae 
Puccinia glumarum 
Poterium 
Triticum 
yy 
2 or 3 doubt¬ 
ful entries 
1 certain 
Uredospores 
Puccinia graminis 
vulgare 
Poa aspera 
yy 
entry 
enter freely 
yy 
Uromyces Poae 
Poa pratensis 
yy 
yy 
yy 
M 
Puccinia Taraxaci 
Taraxacum 
Tropceolum 
yy 
yy 
Coleosporium Solicit i 
Tussilago 
yy 
yy 
yy 
yy yy 
yy 
Valeriana 
yy 
yy 
yy 
Puccinia pulverulenta 
Epilobium 
»» 
1 entry 
yy 
Puccinia Centaureae 
Centaur ea 
yy 
enter freely 
yy 
Puccinia Menthae 
nigra 
Mentha 
yy 
enter freely 
