Arthur: Uredinales of Porto Rico 
329 
The peculiar appearance of the uredinia led Hennings to place 
this rust in the genus Ravenelia, but the discovery of the aecia 
makes this more ill advised than at first. When the telia are 
found, it is more likely to constitute a new genus, or to belong to 
a little known one. 
In the phanerogamic collection at the N. Y. Bot. Garden, pycnia 
and aecia were found on A. latifoUa from island of Tortola, 
1913, J. A. Shafer 1148. 
104. Uredo Gouaniae Ellis & Kelsey, Bull. Torrey Club 24: 209. 
1897. 
On Frangulaceae (Rhamnaceae) : 
Gouania lupuloides (L.) Urban (G. domingensis L.), 
Jajone Alto, Dec. 3, 5685; Aguadillo, Nov. 22, 5701 ; 
San German, Nov. 8, 5791. 
Gouania polygama (Jacq.) Urban (G. tomentosa Jacq.), 
Guanica, Feb. 3, 
This form is distinguished from the uredinia of Puccinia 
Gouaniae Holw. by the reniform spores with one lateral pore. 
Whether this morphological difference indicates a true specific 
distinction, or only a racial one, is not likely to be decided until 
teliospores of this form are found, and possibly not until the 
full life cycle of both forms is known. 
The collections by Dr. Stevens are the only ones known to the 
writer except the type collection made by A. E. Ricksecker in 
St. Croix, Jan., 1896. 
105. Uredo Commelyneae Kalchbr. Grevillea ii : 24. 1882. 
On Commelinaceae: 
Commelina virginica L. (C. elegans H. B. K.). Coamo 
Springs, Nov. 13, 3981. 
So far as the writer knows, this species of rust has heretofore 
only been known from the type collection, made at Port Natal, 
South Africa. Through the kindness of the Director of the 
Kew Gardens, I have been able to study a portion of the original 
material from the Kew Herbarium, and find that it agrees per- 
fectly with the material collected by Dr. Stevens. Hoping to 
