ARTHUR: NEw SPECIES OF UREDINEAE 577 
early naked, somewhat pulvinate, pulverulent, chocolate-brown, 
ruptured epidermis conspicuous; urediniospores broadly ellipsoid 
or obovoid, 21-26 by 26-314; wall cinnamon-brown, rather thick, 
2-2.5u, hilum usually ee aa bias echinulate, pores 2, 
opposite and equatorial, readily se 
On Beloperone californica ett western edge of the Colorado 
Desert, California, April 17, 1907, S. B. Parish 6170, communi- 
cated by E. W. D. Holway. This acanthaceous rust is somewhat 
similar to Uredo varia Diet. of Brazil, but differs materially in all 
gross and microscopic characters except size and we of spores. 
It is a conspicuous form. 
Uredo Wilsoni sp. nov. 
II. Uredinia hypophyllous, scattered, punctiform, 0.1-0.3 
mm. across, soon naked, pulverulent, chestnut-brown, ruptured 
epidermis inconspicuous; paraphyses abundant, peripheral, terete, 
apparently jointed, walls smooth, colored; urediniospores globoid, 
or broadly obovate, 21-25 by 26-294; wall light chestnut-brown, 
rather thick, 2-2.5u4, strongly verrucose with colorless, conical 
warts, slightly separated from each other, pores 2, opposite and 
equatorial, not easily seen. 
On Anastrophia bahamensis Urban, Hanna Hill, Long Cay, 
Bahama Islands, Dec. 7-17, 1905, L. J. K. Brace 4029. This rust 
was detected by Mr. Percy Wilson of the New York Botanical 
Garden, while studying the West Indian collections in the herba- 
rium, and in recognition of this and other services rendered to the 
taxonomic work of the North American flora, both mycological and 
phanerogamic, I take the opportunity to express appreciation in 
the form of the name. 
The powdery spores of the rust are entangled in the thick, 
cottony pubescence of the lower surface of the leaf, as they are 
discharged from the minute, subepidermal sori, and make fuscous 
spots in the white felted surface. Only one collection bore the 
rust. Other collections of the same host and also those of other 
species of the same genus showed very similar spots at first mis- 
taken for it, which are made by a blackish and non-pulverulent 
pyrenomycetous fungus. 
The spores of this rust are not especially notable, but the long, 
jointed paraphyses are highly distinctive and unusual. Its occur- 
rence within the tribe Mutiseae of the composites, from which 
