634 MINNESOTA BOTANICAL STUDIES. 
EXsIcc. : 
Jaczewski, Komarov, Tranzschel, Fungi Ross. no. 16™. 
Ellis and Everhart, N. Am. Fungi, nos. 254™, 10077, 
DAR Tens 
Seymour and Earle, Econ. Fungi, no. 456™. 
Thueman, Myc. Univ., no. 4301. 
Linhart, Fungi Hung., no. 331%. 
Krieger, Fungi Sax.,nos.' 1107, 111 ™, 472", 562 7, 5eanee 
10061. 
Rabenhorst, Fungi Europ., no. 21941. 
Sydow, Mycotheca Marchica, no. 468. 
Sydow, Ured. Exsicc., nos:-33'™, 821, 117"; \280 = agen 
279) 0404, 935 71,1130 “4 11844) 12202. 
shear NY. Fungi, no. 321 1. 
Vize, Pung Brit. no. 777,212. 
Auteecious, inhabiting species of Vvola. 
O. Spermogonia preceding or accompanying the ecidia, amphi- 
genous, punctate, honey yellow; spores elliptical or nearly globose, 3 
to 5 » broad by 4 to 6.5 » long. 
I. A&cidia hypophyllous and also on petioles, pedicels and calyx, 
substratum moderately thickened, in indefinite and irregular clusters, 
often covering nearly the whole leaf, especially noticeable on the veins 
and stalks, crowded; cups broad and low, rather coarsely lacerate and 
irregularly recurved; spores subglobose, somewhat angular from com- 
pression, minutely verrucose, 14 to 18 broad by 15 to 22 long (Eu- 
ropean) or 16 to 20y broad by 18 to 26 long (American) ; wall thin. 
II. Uredo chiefly hypophyllous; sori at first in small groups on dis- 
colored spots, later sparsely and indefinitely scattered, soon naked, 
cinnamon brown, pulverulent ; spores subglobose, echinulate, 17 to 
28 » in diameter, brownish yellow; wall varying from thin to thick; 
pores four, equatorial. 
III. Teleutosori hypophyllous, indefinitely scattered, round, small, 
soon naked, pulverulent, chocolate brown; spores brown, usually 
broadly elliptical, less often oblong-ovoid or irregular, slightly or not 
at all constricted at the septum, smooth, or finely tuberculate especially 
on the upper half, 15 to 23 » broad by 21 to 30 long (European), or 
16 to 26 broad by 28 to 44 long (American); apex obtuse, some- 
what thickened, with a pale and broad apicuous, while a similar pro- 
jection often occurs on one side of the lower cell near the septum; 
pedicel hyaline, fragile, not as long as the spore, somewhat deciduous. 
Throughout North America, occurring upon nearly every indi- 
genous species of Vzola. Spermogonia and ecidia from April to 
me 
