32 Arthur : New species of Uredineae 



18-23 by 22-35 /i, wall light yellow, medium thick, 1.5— 2/*, 

 sharply and sparsely echinulate, pores obscure. 



On Dichromena ciliata Vahl, Mayaguez, Porto Rico, April 13, 

 1904, G. P. Clinton (type) ; D. radicans Cham. & Schl., near Troy, 

 Jamaica, May, 1903, L. M. Underwood (hosts determined by N. 

 L. Britton). 



Both collections are much parasitized, making it difficult to see 

 the structure of the sorus. All sections show what seems like a 

 peridium, enclosing the sorus after the manner of that in Ured- 

 inopsis. If it is a true hyphal structure, however, the exact con- 

 struction cannot be made out. 



Aecidium Falcatae sp. nov. 



0. Pycnia amphigenous, in small groups, punctiform, honey- 

 yellow, wholly immersed, subepidermal, in vertical section globose, 

 100-125 fi in diameter. 



1. Aecia hypophyllous, gregarious in rather large, circular or 

 irregular groups, crowded ; peridia short, cylindrical, margin some- 

 what recurved, finely lacerate; aeciospores globoid, 18-23 ^Y 

 19-25 a ; wall rather thin, 2/i, rather coarsely verrucosa 



On Falcata comosa (L.) Kuntze (Amphicarpa monoica Ell.), 



Decorah, Iowa, June 21, 1881, E. W. D. Holway (type); Apios 



Apios (L.) MacM. {A. tuberosa Moench), Ames, Iowa, June 17, 



1879, W. A. Thomas, and Iowa City, Iowa, June, 1886, Thomas 



H. Macbride. 



This aecial stage differs slightly from that on various species 

 of Phaseolus, Strophostyles, and Vigna, in having more prominent 

 aecia, with more globoid and rougher aeciospores, and is therefore 

 described as a separate species from Uromyces appendictdatns Ung., 

 to which it has usually been referred. As it is not known to be 

 followed by any other stage on the same hosts, it is assumed to 

 be a heteroecious species. Besides occurring in Iowa it is reported 

 from Illinois, Minnesota, Wisconsin, and Nebraska. 



Aecidium Triostei sp. nov. 



y 



0. Pycnia epiphyllous, in small groups, punctiform, honey- 

 yellow, subepidermal, seen in vertical section globose, 90-1 30 ft 

 in diameter. 



1. Aecia hypophyllous, in circular groups, 5 mm. or more 

 across, not crowded ; peridium at first hemispherical, low, margin 



