ARTHUR: NEW SPECIES OF UREDINEAE 5 
On Helianthella Nevadensis Greene, Nevada County, California, 
July 31, 1903, d. A. Heller, no. 7072. An easily recognizable 
species on account of its large, thick-walled uredospores, which 
are of the same shade of brown as the teleutospores. It is prob- 
able that Aecrdium Heltanthellae Arth. (Bull. N. Y. Bot. Gard. 2: 
348), found in Wyoming, is an early stage of this species, but no 
direct proof is at hand. 
Ravenelia Caesalpiniae sp. nov. 
O. Spermogonia chiefly epiphyllous, arising beneath the cuticle, 
crowded in small groups, depressed, 15-18 » high by 60-1004 
broad, golden yellow, becoming brownish. 
If. Uredosori chiefly hypophyllous, arising beneath the cuticle, 
at first in small groups circinating about the spermogonia, finally 
irregularly scattered, roundish or oblong, at first yellowish, after- 
ward ochraceous, ruptured cuticle noticeable; uredospores ob- 
ovate-cuneate, 16-23 by 28-35; wall thin, 1.5-2 4, sometimes 
slightly thicker above, 1.5~3 4, chestnut-brown, often paler and 
almost hyaline below, nearly or entirely smooth above, promi- 
nently and evenly echinulate below, pores 4, a little above the 
middle; paraphyses of the periphery clavate, nearly colorless, 
wall uniformly thin, I-1.5, paraphyses intermixed with the 
spores numerous, capitate, slightly tinted above, head globose 
with very thick wall, pedicel solid. 
III. Teleutospores unknown. 
On Caesalpinia sp., near Bayamon, Porto Rico, June 14~July 
22, 1901, L. M. Underwood and R. F. Griggs, no. 879. 
Ravenelia Portoricensis sp. nov. 
II. Uredosori amphigenous, in circinating groups about 3 mm. 
across, subepidermal, soon naked, pulverulent, fulvous, encircling 
epidermis noticeable ; uredospores elliptical, 16-18 by 24-297; 
wall medium thick, 2.5 4, golden yellow, thickly echinulate, pores 
8, scattered ; paraphyses none. 
Ill. Teleutospores unknown. 
On Cassia emarginata L., Ponce, Porto Rico, December 3, 
1902, A. A. Heller, no. 6193. 
Uredo superior sp. nov. 
IJ. Uredosori mish Te elongated, tectate, spores escaping 
through slits in the epidermis; uredospores globoid, 28-34 by 
32-34; wall thick, 3-4 4, light chestnut-brown, thickly echinu- 
late, pores 2, in upper hemisphere. 
