UREDINALES 



A group of Fungi which are obligate parasites on ferns 

 and the higher plants. Mycelium filamentous, branched, septate; 

 developed within the tissues of the host, producing teleuto- 

 spores (resting spores, chlamydospores) which on germination 

 give rise to a generally four-celled "basidium," each cell of 

 which may in turn produce, on a sterigma, a single basidio- 

 spore (conidium). In addition, there are often produced 

 sperrnatia (in spermogones), recidiospores (in gecidia), and uredo- 

 spores (in sori). 



PUCCINIACEiE 



Puccinie/E. Teleutospores of one or two cells, ( 



scarcely gelatinous (except the pedicels in some ■< " . 



o N \Puccmva. 



foreign species). \ 



PHRAGMiDiEiE. Teleutospores of more than two 

 cells, the walls of the pedicels subgelatinous. 



f Tripfiragmium. 



Teleutospores more or less verrucose. \ n , ... 



1 { L hragmiaium. 



_ , , , f Kuehneola. 



leleutospores nearlv or quite smooth. A ^ 7 , 



Gymnosporajstgie^e. Walls of pedicels of teleuto- [ 



spores becoming highly gelatinous. {Gymnosporangium. 



UROMYCES Link. 



Autoacious or heteroecious. 



Spermogones deeply embedded in the tissues of the host, 

 flask-shaped with conical mouth and ostiolar filaments. ^Ecidia 

 with an evident, usually cup-shaped peridium ; a?cidiospores 

 with indistinct germ-pores. Uredospores formed singly on 

 their pedicels, with several usually rather distinct germ-pores 

 which are often surrounded by a thickened border, rarely 

 accompanied by paraphyses. Teleutospores one-celled, on dis- 

 tinct pedicels, almost always with an apical germ-pore. Basi- 

 diospores flattened on one side or kidney-shaped. 



