﻿New species of Uredineae — IX* 



Joseph Charles Arthur 



In the interim of four years since the last group of species was 

 published in this series a considerable number of forms have been 

 separated which appear to be undescribed. Some of these forms 

 have been recognized for a long time, such as Puccinia Dondiae, 

 collected in 1882, P. agnita and P. valida, both collected in 1898, 

 but as they have been known from single collections only, their 

 previous pubHcation has been withheld, hoping that more informa- 

 tion would become available. The species are now issued to call 

 the attention of collectors to them. 



Four species of short-cycle forms are included in this group, 

 Uromyces ahhreviatus on Psoralea, Puccinia tumamocensis on 

 Dipterostemon, P. agnita on Claytonia and P. Fraseri on Hieracium. 

 These are especially interesting, as they are on common hosts 

 bearing long-cycle species. The first two mentioned are closely 

 correlated with more abundant long-cycle forms occupying the 

 same region and the same hosts. Such forms are often overlooked 

 in the too common way of naming collections without much 

 regard to the life cycle. To the student interested in the phylog- 

 eny and classification of the rusts these short-cycle forms present 

 a suggestive series of problems, and their recognition under dis- 

 tinctive names is highly important. 



XJropyxis Wootoniana sp. nov. 



O. Pycnia not seen. 



II. Uredinia hypophyllous, numerous, scattered, rarely con- 

 fluent, round to oblong, 0.5-1 mm. long, early naked, somewhat 

 pulverulent, pulvinate, light cinnamon-brown; paraphyses absent; 

 urediniospores terete-fusiform or ovate-fusiform, 13-19 by 35-45 a*; 

 wall pale yellow or colorless, 2-4 fi thick, thicker at apex, 5-9 /* 

 with hyaline umbo, finely and closely verrucose, the pores 8-12 



*New Species of Uredin. 



V 583-5? 



