THE SPORE AND ITS DISSEMINATION. 



127 



differences between these pseudospores in the several genera are 

 confined in some instances to their septation, in others to their 

 mode of development. In the jJBaUKacei the pseudospores are 

 more or less globose, produced in chains within an external 

 cellular peridium. In the Cceomacei they are simple, sometimes 

 produced in chains, and sometimes free, with or without a 

 caduceous*ped uncle. In the Ustilaginei they are simple, dark 

 coloured, and occasionally attached in subglobose masses, as 

 in Urocystis and Thecapkora, which, are more or less compact. 



FIG. 58.- Pseudospores of 

 Thecaphora hyalina. 



FIG. 59. Pseudospores 

 of Puccinia. 



*f 



FIG. 60. Pseudospores of 

 Triphragmium. 



In the Puccinicei the distinctive features of the genera are based 

 upon the more or less complex nature of the pseudospores, which 



FIQ. 61. Pseudospores of Phragmidium 

 bulbosum. 



FIG. 62. Melampsora salicina. 

 (Winter fruit.) 



are bilocular in Puccinia, trilocular in TripJiragmium, multilocular 

 in Phragmidium* &c. In the curious genus Podisoma the septate 



