1889.] 



MICROSCOPICAL JOURNAL. 



ni 



Uredineae. 



Peziza. 



Claviceps. 



I 

 Xvlaria. 



"l 

 I 

 Polystigma 



Zygomycetes 



Pvronema. 



Ascobolus. 



Ustilaginea;. 



Saprolegniae. 



The internal systematization of the order is based principally npon 

 1st, structure of the tcleutospores ; 2d, peculiarities of species or groups 

 of species in regard to life-history. On the first depends the grouping 

 of the genera, on the latter that of the species. According to structure 

 of tcleutospores a genus may fall under one of four divisions : 



1st. Amerospor^e, Sacc. cG De Toni. Tcleutospores unilocular, as 

 in Uromyces. 



2d. Didymosporai, Sacc. & De Toni. Tcleutospores bilocular, as 

 in Puccinia. 



3d. Phragmosporje, Sacc. & De Toni. Tcleutospores 3-plurisep- 

 tatc, as in Phragmidium. 



4th. Dictyosporas, Sacc. d' De T'oni. Tcleutospores variously sep- 

 tate, transversely, longitudinally, or obliquely, as in Triphragmium. 



Considering the telcutospore as the ultimatum of the spore series and 

 its germination, the development of a promycelium and sporidia, as the 

 beginning, these divisions are subdivided upon the basis of the num- 

 ber, relati^'e position, and nature of the intervening spore forms between 

 the sporidium and the telcutospore. This gives rise in the Puccinia; to 

 the following divisions, which arc subdivided according^to various slight 

 variations in the spore form of the species. 



1. Eupuccinia, Schrceter : Spermogonia, lecidia, uredo- and tcleuto- 

 spores developed upon a living host plant, tcleutospores germinating 

 only after a period of rest. 



a. Autopuccinia. De Bary : Spermogonia, tecidia, uredo- and 

 tcleutospores formed upon the same host. 



b. Heteropuccinia, Schrceter : Tcleutospores and urcdospores 

 upon one host ; jccidia and spermogonia upon another of a 

 different genus. 



2. Brachypuccinia, Sc/ira'ter : ^-^cidia wanting. 



3. Hemipuccinia, ScJirceter : yEcidia and spermogonia wanting. 



4. Pucciniopsis, Sc/invtcr : Uredo wanting. 



