1 9 20] BISBY— UROM YCES 2 o I 



This rust, previous to Sydow's description in 1906, passed as 

 U. Erythronii (DC.) Pass., a related European species possessing 

 aecia. Thus Ellis and Everhart's Fungi Columbiani 750 was 

 issued as U. Erythronii. The host of this collection is undoubtedly 

 Erythronium parviflorum; earlier collections of this host were fre- 

 quently considered, as in this case, to be E. grandiflorum. 



This rust occurs upon the species of Erythronium found in the 

 western part of North America. According to Engler (Exgler 

 and Prantl, Nat. Pflanz. 2 5 :6o. 1888) species of Erythronium 

 occur particularly in North America. He places the following 

 genera together to constitute the section Liloideae-Tulipeae : Lilium, 



Tulip 



Several 



am 



rusts occur upon these genera of hosts. For the sake of comparison, 

 all such rusts are tabulated. To avoid a personal factor, the data 

 are largely from the Sydows' Monograph, and any supplementary 

 data obtained are added in brackets. Parentheses indicate a rather 

 free translation. Some data are taken from a paper by Rees 

 (Amer. Jour. Bot. 4:368-373. 1917), who also presents drawings 

 which support the contention that the rusts on these hosts possess 

 rather unusual morphological similarities. 



Table II shows many points of similarity in these rusts. It is 



)higenous, rounded or 

 minute, pulverulent sori, with spores broadly ellipsoid, rather 

 similar as to size, with the wall usually moderately thick, apex 

 somewhat thickened with a papilla, pedicel hyaline and short; 

 and especially, all possess, in a striking manner, surface markings 

 usually striate or verrucose and arranged in rows. This unanimity 

 in morphological characters would indicate that a closely and defi- 

 nitely related group of rusts occurs upon these related hosts. 

 Correlations, more or less perfect, obtain throughout this group 

 of rusts upon the Liloideae-Tulipeae, and are found to extend 

 further through the Liliaceae. Figs. 1-6 illustrate, for comparison, 

 the teliospores of three of these rusts. 



2. Uromyces bauhiniicola Arth. Bot. Gaz. 39 : 3§Q- i 9°5- — 



Telospora Bauhiniicola Arth., Result. Sci. Congr. Bot. Vienne 346. 

 1906. 



