446 
AMERICAN JOURNAL OF BOTANY 
[Vol. 8. 
I. Aecia hypophyllous, subepidermal, scattered over the entire leaf, 
cupulate, 0.1^.5 mm. in diameter; peridium white, the margin remaining 
somewhat incurved, erose; peridial cells rhomboidal in side view, 15-20 by 
24-35 /JL, overlapping considerably, the outer wall 7-9 jjl thick, faintly trans- 
versely striate, the inner wall 3-5 (jl thick, closely and finely verrucose; 
aeciospores somewhat angularly globoid or ellipsoid, 12-17 by 13-21 fx; wall 
colorless, thin, i or less, closely and very finely verrucose. 
Biciiculla Cucullaria (L.) Millsp. (Dicentra cucullaria Torr.), Pine Hills, 
Union Co., 111., April 24, 1882, A. B. Seymour 4252 ; Madison, Wis., June, 
1884, L. H. Pammel; Decorah, la.. May, 1886, E. W. D. Holway (Barth. 
N. Am. Ured. 203); May 18, 1887 (Sydow, Ured. 497) \ Iowa City, la.. 
May 7, 1887, Thos. H. Macbride; Morning Sun, Iowa, April 16, 1895, 
Geo. W. Carver; Manhattan, Kan., May, 1888 (Kellerm. & Swingle, Kan. 
Fungi 2); Topeka, Kan., May 9, 1904, H. W. Baker (Ellis & Ev. Fungi 
Columb. iQOj); Oakwood, S. Dakota, May 9, 1891, E. N. Wilcox; 
Crawfordsville, Ind., June, 1893, E. W. Olive; Concordia, Mo., June 20, 
1888, May, C. H. Demelrio (Rab.-Paz. Fungi Eur. 4JJ5; Nebraska, 1899, 
A. A. Hunter; Nebraska City, Nebr., April, 1899, Thornber; Lancaster, 
Pa., May 5, 1900, A. A. Heller 4972; New York City, Apr. 21, 1913, 
May 4, 1914, F. D. Fromme; Van Cortlandt Park, New York City, 
April 25, 1912, F. D. Fromme; April 20, 1915, P. Wilson 52; Williams- 
bridge, New York City, April 28, 1916, P. Wilson 2jo; vicinity of 
Grassy Sprain Reservoir, Westchester Co., N. Y., May 27, 1916, P. 
Wilson 248; West Orange, N. J., May 9, 1915, P. Wilson 59; Brownfield 
Woods, Urbana, 111., May 18, 1919, H. W. Anderson. 
Type Locality: Madison, Wisconsin, on Dicentra Cucullaria. 
II. Uredinia hypophyllous, few, scattered or in small groups, 1-2 mm. 
across, round, small, 0.1-0.2 mm., remaining partially covered by the epi- 
dermis, pulverulent, yellow, ruptured epidermis evident; paraphyses 
peripheral, hyphoid, 7-10 by 26-48 /z, thin-walled, colorless, incurved, 
inconspicuous, not projecting above the ruptured epidermis, arising from 
a more or less developed pseudoparenchymatous mass of mycelium; ure- 
diniospores ellipsoid or obovoid, 18-21 by 20-26 /z, without definite pedicels, 
attached to short, thin-walled, colorless cells; wall colorless, 1-1.5 m thick, 
closely echinulate, the pores obscure. 
III. Telia somewhat gregarious in groups 1-3 mm. across, at first 
arising within and surrounding the uredinia, angular, 0.2-0.5 mm. across, 
at first covered by the epidermis, becoming naked just before germination, 
waxy, slightly tinted, becoming flocculose and white from germination, 
teliospores cylindric or ellipsoid, 10-21 by 29-42 ix, catenulate, in chains 
of 2 or 3 at the center of the sorus, usually only one at the margin; wall 
colorless, very thin, uniformly 0.5 thick; basidiospores globoid, 10-13 m 
in diameter. 
Urticastrum divaricatum (L.) Kuntze {Urtica divaricata L., Laportea cana- 
densis Gaud.), Brownfield's Woods, Urbana, 111., Aug. 19, 1919, II & 
III, H. W. Anderson; Hannibal, Wis., July 27, 1920, III, /. /. Davis. 
In the Urticastrum rust we have a telium differing from that of the 
