THE RUSTS OF NOVA SCOTIA. — FKASEK. 839 



PlCCIMACKAI'. 



I. Teliospores embedde<i in a gelatinous matrix, on 



Coniferae Gymnosporangium. 



II. Teliospores not embeddod in a gelatinous mati'ix. not 



on Goniferae — 



1. Teliosjiores one-celled Uroinyces. 



2. Teliospores more than one-celled. 



^1. Telios])(»res two-celled — 



a. Aecia Avithout pevidiuni 



Gymnoconi(u 



h. x\ecia with peridium .... Piircinia. 



B. Teliospores more than two-celled — 

 a. Spore cells in a row — 



(1) Telios]K:)ves colourless 

 Kueltncola. 



(2) Teliospores coloured 



Phragmidium. 



h. Spore cells, three in the form of 

 a triad Triphragmium. 



All the genera included in this synopsis are re]>resem:e<l 

 in Kova Scotia except Gall o may a and Hyalopsora. The last 

 one will ])it;>bably yet be found. 



Arthur ha.s adopted a new system of classification of the 

 rusts. His classification is based largely on the number of 

 spore forms ])resent. For example the genus Pncrlnia as now 

 commonly known is replaced by four genera, Dasyspora with 

 teliosj)ores, Bullaria with urediniospores and teliosjx>res. 

 AUodus with aeciosjxn'es and teliospores. and Dicaeoma with 

 all spore forms. Yvt ihe author of the syst<^ni .states) that "it 

 would be a Avholly false inij^ression to assume that this 

 charactxir of the suppression of the spare forms is the only one 

 separating the genus from others of the grouji. It is the 

 most prominent and most easily .stated, but in the most cases 

 will be found associated with other characlois of accepted 



