132 SEMI-CENTENNIAL OF TORREY BOTANICAL CLUB 
Pycnia amphigenous, thickly scattered among the telia over 
dark-colored, hypertrophied and bullate areas 2-8 mm. across, 
noticeable, subepidermal, dark brown, globoid or flattened- 
globose in section, 80—130 и in Y by 65-125 и in height; 
ostiolar filaments compact, 30-40 u 
Telia amphigenous, scattered over uL isi bullate areas, 
2-8 mm. across, strongly punctiform, main part of the sorus very 
deep-seated within the mesophyll, opening by a pore; paraphyses 
and peridium none; teliospores obovate or fusiform, 16-29 by 
40—58 и, narrowed below, rounded or somewhat narrowed above; 
wall colorless or nearly so, the inner portion firm, 1-2 и thick, the 
outer portion hygroscopic, swelling to 5-15 д thick, strongly tuber- 
culate along prominent ridges or wings, especially toward the 
summit; pedicel completely fugacious. 
This rust is most unusual in gross appearance. The swollen 
areas are prominent, both from the chocolate-brown color and 
from being well raised above the leaf surface. The teliospores are 
ejected from the narrow openings of the sori in colorless masses. 
In vertical section the sori are found to be flask-shaped, with two 
or more layers of host cells above them, and having the spores 
developed from a hymenium at the base. The crested appearance 
of the teliospores is highly distinctive. 
The specimens collected by Baker in 1905 were on old and 
bleached leaves, and had little appearance of a rust. А packet in 
the Arthur herbarium had been labelled Gymnosporangium guara- 
niticum, a synonym for a Hyphomycetous fungus now called 
Patouillardiella guaranitica. The identity of the fungus was not 
ascertained, although much study was given to it, until the excel- 
lent material from the junior author was available. The charac- 
ters of the rust were then easily obtained, and soon identified with 
those of Uredo cristata Speg., a species founded on an unidentified 
species of Sapindaceae, collected by B. Balansa in Paraguay, 
January, 1882, no. 3474. А new specific name is now given, as 
the one applied by Spegazzini is already in use in the genus Uromy- 
ces. 
In his comments Spegazzini calls it “species pulcherrima dis- 
tinctissima," which it truly is. It is a short-cycled rust, so very 
distinctive that it is impossible to state its systematic position. 
Although described as а Uromyces, yet it has affinities with both 
the Uropyxidatae and Phragmidiatae. There is considerable 
