1889.] MICROSCOPICAL JOURNAL. 



Uredinese. 



171 



Claviceps. 



i 

 Xylaria. 



I 

 i 

 Polystigma. 



Zygomycetes. 



Peziza. 



Pleospora. 



Melanospora. 



Erysiphese. 



.Podosphsera 



-Peronosporese 



Alga;. 



Lichens 



Pyronema. 



Ascobolus. 



Ustilaeinese. 



Saprolegniaa. 



The internal systematization of the order. is based principally upon 

 ist, structure of the teleutospores ; 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 teleutospores a genus may fall under one of four divisions : 



ist. Amerosporae, Sacc. & De Toni. Teleutospores unilocular, as 

 in Uromyces. 



2d. Didymosporae, Sacc. <& De Toni. Teleutospores bilocular, as 

 in Puccinia. 



3d. Phragmosporae, Sacc. & De Toni. Teleutospores 3-plurisep- 

 tate, as in Phragmiclium. 



4th. Dictyosporae-, Sacc. & De Toni. Teleutospores variously sep- 

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



Considering the teleutospore 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, relative position, and nature of the intervening spore forms between 

 the sporidium and the teleutospore. This gives rise in the Pucciniae to 

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

 variations in the spore form of the species. 



1. Eupuccinia, Schrceter : Spermogonia, aecidia, uredo- and teleuto- 

 spores developed upon a living host plant, teleutospores germinating 

 only after a period of rest. 



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

 teleutospores formed upon the same host. 



b. Heteropuccinia, Schrceter : Teleutospores and uredospores 

 upon one host ; aecidia and spermogonia upon another of a 

 different genus. 



2. Brachypuccinia, Schrceter : vEcidia wanting. 



3. Hemipuccinia, Schrceter: yEcidia and spermogonia wanting. 



4. Pucciniopsis, Schrceter : Uredo wanting. 



