ARTHUR: NEW SPECIES OF UREDINEAE Sis 
cose, more evidently so above; pedicel colorless, slender, fragile, 
half length of spore or less. 
On Allium reticulatum Don, Dead Lake, Pikes Peak, Colo., 
3500 meters alt., August 20, 1904, F. E. & E. S. Clements (Clem- 
ents, Crypt. Format. Color. r4r). The collection was issued 
under the name P. mutabilis, but differs from that species in the 
more oval teliospores without constriction, and with distinctly 
verrucose surface. No urediniospores are present, not even in the 
teliosori. Whether urediniospores and aeciospores occur in the 
life cycle, or not, can not be told or even inferred from the material 
in hand. Even the material of the host is scanty, showing neither 
flowers nor bulbs, and some doubt must attach to its correct 
determination. As it has been impossible to match this material 
with any other known rust, it is recorded here to attract the 
attention of collectors. 
Uromyces aemulus sp. nov. 
O. Pycnia very few, punctiform. 
I. Aecia amphigenous, rather closely but irregularly arranged 
in oval groups 0.5-I mm. long, on pale unthickened spots, cylin- 
drical, margin erose or somewhat lacerate; aeciospores globoid or 
irregularly ellipsoid, 20-24 by 23-26u, often angular; wall pale 
yellow, 1.5-2y thick, finely verrucose. 
II. Uredinia amphigenous, widely scattered, oblong or oval, 
0.5-2 mm. long, dehiscent by longitudinal slits, yellow or light 
cinnamon-brown; urediniospores globoid or broadly ellipsoid, 
22-29 by 25-33; wall golden yellow, 1.5-2u thick, inconspicuosly 
echinulate, pores indistinct, 5-8, scatter 
II. Telia amphigenous, scattered, prdiminent, usually oblong, 
0.8-3 mm. long, at first covered by the gray epidermis, eventually 
naked, somewhat pulverulent, dark chocolate-brown or blackish; 
stroma absent; teliospores globoid or obovate-globoid, 18-24 by 
24-30u; wall chestnut-brown, concolorous, 2—2.5u thick, slightly 
or not thickened above, 2.5—4u, smooth; pedicel slender, about 
once length of spore. 
On Allium brevistylum S. Wats., Yanceys, Yellowstone National 
Park, Wyoming, July 17, 1899, A. & E. Nelson 50920 (type). 
The host was determined by Dr. P. A. Rydberg, January 1907, 
from the specimen in the cryptogamic herbarium of the New York 
Botanical Garden. Sori of all spore forms are fairly well repre- 
sented in this collection. They bear the customary relation 
