196 



Mycologia 



Link's 1816 classification was followed by Nees in 181 7 and by 

 S. F. Gray in 182 1. Later came a series of authors, Schweinitz, 

 Wahlenberg, Castagne, Leveille and the Tulasnes, who in their 

 disposition of Uromyces followed the methods of no one author 

 but who endeavored to follow the combined good points of Per- 

 soon, DeCandoUe and Link, which resulted in general confusion. 



It remained for Fries,^ the " Father of Mycology," to take up 

 in 1846 the name Uromyces, which had been technically estab- 

 lished as a genus by Unger^ in 1833, place it in its present 

 generic use. He made the noteworthy statement Plurimae 

 Pucciniae analogae respondent," a fact which none of the later 

 urediniologists have refuted, and one which touches closely upon 

 the subject of this paper. Schroeter^*^ clearly brings out this 

 analogous relation when he divides the genus Uromyces into 

 biologic forms as eu-, brachy-, -opsis, micro-, and lepto-, in exactly 

 the same manner as he did with the genus Puccinia. 



Magnus^^ has called attention to the close morphological rela- 

 tionship existing between Puccinia and Uromyces on species of 

 Rumex and has shown that in these species the urediniospores of 

 the two genera intergrade in size and germ-pore characters on 

 different species of host plant so that it is difficult to separate 

 them in the uredinial generation. 



Fischer in 1904^- pointed out that a closer relationship existed 

 between certain species of the genera Puccinia and Uromyces than 

 existed in either genus alone, a fact which Arthur also observed 

 and commented on in his " Classsification of the Uredinales."^^ 

 Later in an article on " Reasons for Desiring a better Classifica- 

 tion of the Uredinales Arthur calls them "parallel genera" 

 dififering only in the technical character of their teliospores. 



McAlpine in his fine work on "The Rusts of Austraha"^^ in 

 speaking of Puccinia says : " The presence of mesospores in a 



^Sumrna Veg. Scand. i: 514. 1846. 

 »Exanth. Pfl. 277. 1833. 



"Abh. Schles. Ges. 48: 8-1 1. 1869. Schroeter in Cohn, Krypt. Flora 

 Schles. 3^: 229-313. 1887. 



"Abh. Bot. Brand. 38: 11-14. 1896. 



Beitr. Krypt. Schweiz. 2^: xlvi. 1904. 



Result. Sci. Congr. Bot. Vienne 334- 1906. 

 "Jour. Myc. 12: 1 50-1 51. 1906. 

 ^^The Rusts of Australia 26. 1906. 



