148 
THE UROMYCES OF EUPHORBIA. 
I read with very great interest Prof. W. Voss’s communications 
in the “ Austrian Botanical Journal ” for 1876, No. 9, p. 299, that 
he, in the Laibach State Forest, found Euphorbia verrucosa largely 
covered with iEcidium, and that between the iEcidium cups at the 
end of May the stroma of Teleutospores of U. scutellatus (Pers.), 
Lev., appeared. Professor W. Voss, at my request, most kindly 
sent me the specimens which were laid before the Society of 
Naturalists at their March meeting this year. 
In the examples sent, the iEcidium cups and Uromyces grow in 
closely the same characteristic manner as on Euphorbia Cyparissias , 
so that one is very much inclined to consider both to be the same 
species. On the stalk which bears both forms of fructification, the 
Uromyces stroma grows between the iEcidium cups ; on the other 
stalk there are exclusively Uromyces. This common successive 
growing of the iEcidium cups and Uromyces stroma on one stem, 
as observed by Voss, makes it very probable that both these forms 
of fructification belong to one circle of evolution. While, there- 
fore, the iEcidium cups and Uromyces stroma treated of above on 
Euphorbia verrucosa accord closely in their appearance with those 
on Euph. Cyparissias, yet the Teleutospore itself shows a difference, 
so that on that account we may consider the Uromyces on Euph. 
verrucosa as specifically different from Urom. scutellatus , Lev., on 
Euph. Cyparissias. That is to say, the Teleutospores of the 
latter have strong projecting, short fillet-formed, irregularly placed 
thickenings on the epispore, while the Teleutospores on Euph. 
verrucosa are quite smooth. Herein they agree with the Uromyces 
which grows on Euphorbia Gerardiana , which also attacks its 
closely allied plants in the same way as Uromyces scutellatus , Lev. 
I had not, in truth, hitherto been able to observe with certainty an 
iEcidium on Euph. Gerardiana ; yet certainly, Fuckel, in “ Sym- 
bols Mycologicse,” p. 64, gives the appearance of an iEcidium on 
Euph. Gerardiana , and Dr. Scliroeter communicates to me by letter 
that he has observed an iEcidium on Euph. Gerardiana at 
Bheinufer, and this, also, Kornicke reports in the above-mentioned 
communication, and Oudemans even shows in “ Aanwinsten voor de 
Flora Mycologica van Nederland ” (3 e Bijlage tot de 30 e Jaarver- 
gadering der Nederl. Bot. Veraeniging), p. 8, that Uromyces scu- 
tellatus, Lev., Fungus hymeniiferus and teleutosporiferus grow near 
Amtem on Euphorbia Gerardiana. 
One asks oneself now how the Uromyces, with smooth-mem- 
braned teleutospores, which grow on Euphorbia verrucosa and E. 
Gerardiana , is to be characterised. In Duby “ Botanicon gallicum,” 
p. ii., fig. 896, there are three distinct species of Uredo on different 
Euphorbiaceae. The one is the Uromyces proeminens , Pass., on 
Euphorbia Chamcesycce , which Saccordo recently in “ Hedwigia,” 
1875, p. 192, has unnecessarily newly advanced and described 
as Uromyces Chamcesycis , Sacc. In addition there are de- 
scribed Uredo scutellatus , Pers., “ In Euphorbiis variis prcesertim 
in E. Cyparissia , cujus folia inde deformantur and Uredo excavata, 
DC., “ ad Euphorbias varias prcesertim in provinciis australibus .” 
