THE UREDINALES FOUND UPON THE ONAGRACEAE 
547 
rust which they bear. This race is quite uniform and unvariable, 
and almost of world wide distribution. The apex of the teliospore 
is, in this race, but moderately thickened, 3-7 /x, the wall cinnamon- 
brown, often finely verucose. Holway separates Puccinia Epilohii- 
tetragoni upon Epilobium from P. Gayophyti chiefly by the position 
of the germ pores of the teliospores, which in Puccinia Epilobii- 
tetragoni, as he considered the species, he finds are one or two in the 
lower cell, midway between the septum and base of the spore. This, 
distinction in general holds, but has not been found of absolute con- 
stancy. This race is rather well correlated with the Uromyces Gaurinus 
race of Uromyces plumharius. 
2. Puccinia glabella race, on Boisduvalia glabella. But few speci- 
mens have been collected from this host. This race possesses the 
the smallest teliospores, 22-39 }x in length, with the apex but slightly 
thickened, 2-7 /x, the wall cinnamon-brown, rather paler below. 
The urediniospores have rather thick walls, 1.5-3 M- This seems on. 
the whole to be a good race, although many collections of the Puccinia 
Gayophyti race show characters quite as in this race, and other Bois- 
duvalia rusts sometimes approach this. 
3. Puccinia heterantha race, on Taraxia. This race is distinguished 
by thick walled teliospores, 1.5-3 m» rather dark in color, cinnamon- 
to chestnut-brown, with the apex but moderately thickened, 3-7 ix. 
Considerable evidence of correlation between the Uromyces Fremontii 
race of Uromyces plumbarius is shown. 
4. Puccinia Oenotherae race. On Boisduvalia [excepting Bois- 
duvalia glabella] (Puccinia Boisduvaliae), Clarkia, Phaestoma (Puc- 
cinia Clarkiae), Chylisma, Godetia, Oenothera (Puccinia Oenotherae), 
Eulobus (Puccinia Eulobi) , Sphaerostigma (Puccinia Sphaerostigmatis) 
and Zauchneria (Puccinia Zauchneriae). This group of hosts possesses 
rusts with thicker walled and darker teliospores, as in the preceding 
race, but with the apical thickening often greater, 4-12 /x, the thicken- 
ing dark colored. The pedicel is sometimes up to 100 /x in length, the 
urediniospore walls thick. This race is correlated in particular with 
the Uromyces Oenotherae race of Uromyces plumbarius, although the 
Uromyces plumbarius and the Uromyces Fremontii races are not greatly 
different. 
The above races of the species Puccinia Epilobii-tetragoni are not in 
all cases exactly correlated with the separate Uromyces plumbarius 
races, since no corresponding parallel of hosts, distribution, etc., fully 
