1918] ARTHUR—UREDINALES 471 
Pycnia epiphyllous, appearing scattered or somewhat grouped, 
honey yellow becoming dark brown, noticeable, subepidermal, 
globoid, 70-125 uw in diameter. 
Aecia amphigenous, appearing scattered or somewhat grouped, 
short cylindric, o.1-o.2 mm. in diameter, 0.3-0.7 mm. high; 
peridium white, lacerate, soon falling apart; peridial cells rectangu- 
lar or rhomboidal, 10-14 by 22-26 yu, slightly overlapping, the outer 
wall 3-4 u thick, transversely striate, the inner wall about 3 u thick, 
closely and somewhat coarsely rugose-verrucose; aeciospores ellip- 
soid, 16-19 by 19-27 yw; wall colorless or slightly tinted, 1-2 y thick, 
finely and closely verrucose. . 
Telia mostly epiphyllous, scattered, round, minute, o.1-0.2 
mm. in diameter, somewhat pulverulent, shining blackish brown, 
ruptured epidermis evident; teliospores ellipsoid or oblong, 19-24 
by 27-35 u, rounded at both ends, slightly or not constricted at 
septum; wall dark chestnut brown, uniformly 2.5-3 yu thick, 
smooth; pedicel yellowish, slightly darker above, somewhat 
fragile. 
18. Puccrnta SpEGAzzInu DeToni (on Carduaceae).—Mikania 
scandens (L.) Willd. (?), Santa Clara, Peru, July 18, no. 18724. 
A very abundant, short cycle rust, found throughout tropical 
America. 
19. Puccinia cuzcoensis, sp. nov. (on Carduaceae).—Baccharis 
floribunda H.B.K. (?), Cuzco, Peru, September 1, I, II, no. 19054. 
ecia amphigenous, few, crowded in circinating groups, 3-5 mm. 
across, rather large, o.2-0.4 mm. across, or confluent into curved 
sori 2 mm. long; peridium none, the epidermis overarched and 
rupturing centrally; aeciospores angularly ellipsoid or globoid, 
21-26 by 29-35 u; wall pale yellow or colorless, 2-3 u thick, closely 
and finely verrucose. : 
Uredinia chiefly hypophyllous, numerous, scattered, roundish, 
-5 mm. across, early naked, pulverulent, chestnut brown, 
ruptured epidermis prominent; urediniospores rhombic-ellipsoid, 
27-34 by 39-42 u; wall golden or cinnamon brown, thick, 2. 5-3 x, 
very closely and rather bluntly echinulate, the pores large and 
distinct, 2, equatorial. 
Telia not seen. 
The species in its aecia, both from their caeomate structure and 
spores, is very much like Puccinia Montoyae Mayor, described on 
the same host from Bogota, but no teliospores are available with 
which to make a comparison, and the abundance of very conspicuous 
