THE UREDINALES FOUND UPON THE ONAGRACEAE 537 
4. PucciNiASTRUM CiRCAEAE (Thiim.) Speg., Dec. Mycol. Ital. No. 
65. 1879. 
Literature: Saccardo, Syll. Fung. 7: 763. 1888. Schroeter, Pilze Schles. i: 
364. 1889. Klebahn, Krypt. Mark Brand. 5**: 833. 1914. Sydow, Monogr. 
Ured. 3:445. 1915. 
This European species upon Circaea presents no very tangible 
morphological differences from Pucciniastrum pustulatum. The hosts 
are different. Cultures, moreover, have so far failed to produce in- 
fection upon or from Abies, so that this species may well be considered 
to be distinct. 
Klebahn (/. c.) gives some evidence for his suggestion that perhaps 
an overwintering of the rust occurs in the rhizomes of the host. 
The synonym Erysibe pustulata Circaeae Wallr., Fl. Crypt. Germ. 
2: 198. 1833, does not seem to appear in recent literature. 
5. Uromyces plumbarius Peck, Bot. Gaz. 4: 127. 1879. 
Descriptions: N. Amer. Fl. 7: 262, 1912. Sydow, Monogr. Ured. i: 54-56. 
1909. 
This American species, treated here as in the North American 
Flora, represents a combination of four species described by different 
authors upon different species of host. This somewhat variable species 
falls into morphological races, corresponding in a general way with 
previously described species, as follows: (i) on Gaura {Uromyces 
Gaurinus). This race possesses teliospores of moderate size (16-23 
by 24-33 ii), with the apex thickened the least of those of any of the 
races, 4-7 11. A suggestion of verrucose markings can sometimes be 
seen upon the teliospores of this race. (2) On Kneiffia and Oenothera 
{Uromyces Oenotherae). This race is distinguished by dark-colored 
teliospores, with the apex the thickest of those of any of the races, 
7-14 ju. The apex is often pointed, and the pedicel length the greatest 
in this species. (3) On Luxauvia, Pachylophus, and Onagra {Uromyces 
plumbarius). This race has the smallest teliospores (14-20 by 21-28 m), 
with the apex but moderately thickened. The teliospores have been 
found to be very finely and inconspicuously verrucose, hardly notice- 
able unless the spores are viewed with the oil immersion. (4) On 
Megapterium Fremontii {Uromyces Fremontii). This race possesses 
teliospores with the thickest walls, sometimes to 3 ix. The teliospores 
are comparatively narrow and long. 
The correlation of this species and these races with the corre- 
