
1913] CURRENT LITERATURE 237 
vulgare L. failed to infect that host. P. Pringsheimiana Kleb. grown on Carex 
acuta L. failed to infect Ribes nigrum L., although R. Grossularia L. was freely 
infected. An attempt to confirm L1ro’s observation that Pedicularis palustris 
L. is the teleutospore host of Peridermium Pini Willd. (Kleb) was not successful. 
Sowings of aecidiospores on a number of other possible hosts resulted in 
failure, so that the teleutospore host of this important rust is still unknown. 
Aecidiospores of Aecidium Circaeae Ces. from Circaea lutetiana L. failed to 
infect Brachypodium silvaticum R. Sch., which was regarded as a possible 
alternate host for this fungus. 
In conclusion, the author adds some observations on the wintering of uredo- 
spores of grain and otherrusts. The uredosp f Melampsoridium betulinum 
(Pers.) Kleb., M elampsora Larici Tremulae Kleb., Thecopsora Vaccinii (Alb. 
et Schw.) Winter, and Kuehneola albida (Kiihn) Magnus were incapable of 
surviving the winter. Some observations on an unknown species of Melamp- 
sora on Populus alba L. indicate that the mycelium of this fungus persists in 
the buds and produces uredinia on the unfolding leaves. All attempts to 
infect grasses with teleutospores of Puccinia graminis failed. To account 
for the appearance of the grain rusts in spring it has been suggested that the 
fungus is carried over with the seed. To test this hypothesis further, the 
author planted a number of plots with seed from plants badly infected with 
rust, but the young plants were free from rust in every case. 
FiscHER publishes two papers on the specialization of certain rusts. 
The first? deals with specialization of forms within the collective species 
Puccinia Saxifragae Schlecht. inhabiting various European species of Saxifraga. 
Dreret and H. and P. Sypow have shown that the forms associated under that 
name can be separated into a number of species morphologically well marked. 
The possibility that within these species there might exist physiological races 
not morphologically distinguishable led FIscHER to investigate the Puccinia 
on Saxifraga stellaris in Norway. Sowings of the teleutospores were made 
on S. stellaris, S. rotundifolia, S. androsacea, S. nivalis, and Aizoon longifolia. 
Only S. stellaris was infected. In the course of these experiments, FISCHER 
observed that the newly formed teleutospores germinated immediately and 
continued during the entire summer to infect the leaves of the plants on which 
they were borne. The teleutospores of this species, therefore, act indifferently 
like those of a micro-Puccinia or of a lepto-Puccinia. A differentiation of 
the teleutospores into persistent and caducous types, which occurs in other 
species with teleutospores of similar behavior, does not occur in this speci 
n the second paper’ FIscHer gives further results of his investigations 
on the life histories of forms of Uromyces caryophyllinus (Schrank) Winter. 
= ae AD SEE 
“ FiscHer, Ep., Beitrige zur Biologie der Uredineen. 2. Zur Biologie von 
Puccinia Saxifragae Schlecht. Mycol. Centralbl. 1: 277-284. 1912. 
%——. Beitrige zur Biologie der Uredineen. 3. Die Specialization des 
Uromyces caryophyllinus (Schrank) Winter. Mycol. Centralbl. 1:307-313. 1912. 

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