May 1907] Uredinales of North American Flora 91 



hosts" leads to "Hosts belonging to Grossulariaceae" (C. nbi- 

 cola), to "Host belonging to family Loasaceae" (C. mentzeliae), 

 etc. In case of some groups (say Carduaceae) the tribes are rec- 

 ognized (as Vernonieae, Eupatorieae, Astereae, etc.) in separat- 

 ing the species. Then below this, when there are two or more 

 species, morphological characters are called into requisition. 

 Synonomy and exact citations both for the genus and species are 

 given. The convenient paragraphing of the full though concise 

 descriptions is to be highly commended. Under each species the 

 hosts are enumerated — the family in each case first given ; then 

 follow the type locality, the distribution, illustrations when any, 

 and finally the exsiccati are cited. 



Four new species of Coleosporium are here described, 

 namely, C. begoniae from Alexico, C. lacinariae from Florida and 

 Alabama, C. arnicale from Washington, and C. occidentale also 

 from the State last named. Some new combinations are made ; 

 thus Dietel and Holway's Stichopsora mentzeliae and Schwei- 

 nitz's Caeoma (Uredo) helianthi are made Coleosporiums ; and 

 of the latter are listed, as synonyms, Dietel and Holway's C. 

 viguierae and C. verbesinae. Uredo terebinthinaceae and Cae- 

 oma (Uredo) terebinthinaceae of Schweinitz are included in 

 Coleosporium terebinthinaceae (Schw.) Arthur. 



When we turn to the family Uredinaceae we realize more 

 fully the radical and progressive mode of treatment. The diag- 

 nosis of the family, which has the basidia external, is otherwise 

 sufficiently concise and definite, the main points expressed as 

 follows : Telia forming a more or less definite crust or column ; 

 teliospores compacted into layers, or rarely solitary within the 

 tissues (Uredinopsis), sessile. And this family includes these 

 eighteen genera : Uredo, Physopella, Bubakia, Pucciniastrum, 

 Melampsoridium, Melampsorella, Hyalopsora, Calyptospora, 

 Necium, Uredinopsis, Melampsoropsis, Cronartium, Cerotelium, 

 Cionothrix. Alveolaria, Baeodromus, Endophyllum, and Puccino- 

 sira. Even one claiming to be a uredinologist could scarcely say 

 this list with his eyes shut — in fact he might stumblle if his 

 eyes were open ! 



The genus Uredo, Arthuri sensu, includes the plants mostly 

 going under the names of Melampsora Cast., Physonema Lev., 

 Podosporium Lev., Podocystis Fries, and Caeoma Tul. It is 

 evident that this is not the form genus Uredo so familiar to all, 

 in service so long, and perhaps destined to further use in the 

 same sense. In fact Dr. Arthur has elsewhere said that he pro- 

 poses "in his own work to retain such names as Peridermium, 

 Caeoma, Roestelia, Uromyces, and Puccinia as form genera for 

 imperfectly understood species, and even Uredo and Aecidium 

 in their customary acceptance as form genera, if a better course 

 does not become evident. These will constitute an Anhang for 

 recording undistributed and imperfectly known forms." It is 



