90 UROMYCES 
have occurred for many years consecutively on Thrift in my garden, I 
have never noticed the ecidia; the uredospores last through the winter 
on the evergreen leaves, and reproduce the fungus about June ; teleuto- 
spores are rather scarce. 
DistTRIBUTION : Central and North-Western Europe. 
5. Uromyces Trifolii Lév. 
Puceinia Trifolii Hedw. f. in DC. Flor. fr, ii, 225. 
Oromyces Trifolii Lév. Ann. Sci. Nat. ser. 3, viii. 871. Plowr. Ured. 
p. 124 pp. Sacc. Syll. vii. 534 p.p. Sydow, Monogr. ii. 132. 
Fischer, Ured. Schweiz, p. 23 p.p. 
Trichobasis fallens Cooke, Micr. Fung. p. 226 p.p. 
Puccinia fallens Cooke, Handb. p. 508 p.p. 
Nigredo fallens Arthur, N. Amer. FI. vii. 254. 
Uredospores. Sori hypophyllous and on the petioles, 
and like those of U. Trifoli-répentis ; 
spores differing in having 5—7 germ- 
pores. 
RK Teleutospores. Indistinguishable from 
7 those of U. Trifoli-repentis. 
ig. 42. U. Trifolii. . ; : j 
Se ee a v. On Trifolium hybridum, T. incarna- 
pratense. tum, T. medium, T. pratense. Not com- 
mon. (Fig. 42.) 
Liro proved by culture-experiments that the U, romyces on Trifolium 
repens could not be transferred to T. hybridum or T. pratense. Since this 
difference is accompanied by the absence of the ecidium in the latter 
species and by a difference in the number of the germ-pores, they are 
considered distinct by Sydow. But on Trifolium pratense I have found 
uredospores with not more than four gerra-pores, each covered with «a low 
flat hyaline cap. In that case only the absence of the excidium would 
separate the two forms, though the average number of germ-pores is no 
doubt different in the two cases. 
An ecidium has been found elsewhere on 7. pratense, but this has 
been experimentally proved (Dietel, Flora, 1895, Ixxxi. 398) to belong to 
another European and North American species, U. ménor Schrét. = VU. ob- 
longus Vize (Grevillea, v. 110), which has no uredospores, but only ecidio- 
and teleutospores. 
Cooke’s species, U. apiculatus (Grevillea, vii. 136), is indefinite ; the 
form on clover may belong here, that on Luthyrus pratensis to U. Pist. 
DisTRIsurion: Europe, Asia Minor, Persia, North America, 
ete. 
