336 



turn &. molle, growing on the same slope, was also found Uromyces 

 Kabatianus, but in no other place even in the immediate neighbour- 

 hood did I ever found them to be infected. 



It has hitherto been stated that Uromyces Kabatianus belongs 

 solely to Geranium pyrenaicum, but Rostrups observations as well as 

 my own made me attempt to see if, by cultivation, other host-plants 

 might not be found. For this purpose I obtained a number of various 

 seeds of Geranium which I sowed in flower-pots. The Geranium, 

 produced by these seeds, I infected with Uredo-spores of Uromyces 

 Kabatianus on Geranium pyrenaicum. In 1908 I succeeded in infecting 

 Geranium pusillum &. molle, in 1909 Geranium rotundifolium, visci- 

 dulum &. dissectum, and in 1910 Geranium rotundifolium. 



The experiments were made in flower-pots placed in the windows 

 in closed compartments where there was no fear of infection from 

 outside, and the infection was also in each case so complete that it 

 was impossible for it to be attributed to chance. In each case a period 

 of 10 days passed between the sowing of the spores and the appea- 

 rance of the new groups of uredo on the leaves. Accordingly the 

 period of incubation of Uredo-spores is ten days. The flower-pots 

 were covered by a glass-bell the first days after the sowing of the 

 spores. Rostrup considered Urom. Kabatianus a biological form of 

 Urom. geranii (R 96 o 1^°). 



Geranium columbinum. S. Lyngby!. Geranium dissectum. S. Fredriksvaerk, 

 Lyngby!. Geranium molle. S. Fredriksvxrk, Lyngby!. Geranium pusillum. S. 

 Fredriksvaerk, Lyngby!. Geranium pyrenaicum. S. Fredriksvaerk, SeiUerad (June 

 1866 A. S. 0rsted), Dronninggaard, Lyngby. 



1563. Uromyces alchitnillae (Pers.) Lev., Syn: Uredo alchimillae 

 Pers. Syn. ''^^ Schum. no 1534, Fl. D. tab. 1436, Levefod Brandstav 

 (H. 37'"), Levefodrust (R. 04 a"), Lit: Sydowl01'^ Klebahn05b^^ 

 Liro 08 ^r 



Brachy-uromyces, the mycelium winters in the underground parts 

 of the plant and attacks all the leaves in the spring (April— June). 

 The primary uredo-spores produce secondary groups of uredo (June 

 — Juny), and later teleuto-spores. 



Alchimilla alpestris. S. Fredriksborg (A. Lange), Lystrup Hegn!, Bidstrup 

 Hegn!, Jaegersborg!, Jyderup!, 0rsl0v (P. N.). Alchimilla filicaulis. J. Krabbes- 

 holm Skov!; S. Valensbaek Mose (C. H. O.). Alchimilla pastoralis. B. Gud- 

 iijem!. Alchimilla pratensis. S. Botanisk Have!. 



1564. Uromyces anthyllidis (Grev.) Schroeter, Sydow 10 ^\ Rund- 

 bslgrust (R 93 c ^\ 02 a "«, 04 a "). 



Hemi-uromyces. St. II June— Sept., st. Ill July— Octob. 

 Anthyllis vulneraria, common. 



