96 Wisconsin Academy of Sciences, Arts, and Letters. 



Pucciniastrum myrtUli (Schum.) Arth. Specimens bearing 

 telia were collected at Athelstane. The teliospores were more 

 abundant in the epidermal cells of the upper surface of the 

 leaves. Fraser (Mycologia 5:237, 6:27) finds that the aecia are 

 borne on the leaves of Tsuga canandensis. The Peridermium 

 peckii of the provisional list probably belongs to this species. 



The Aecidium sp. indet. on Amphicarpa monoica of the pro- 

 visional list is Aecidium falcatae Arth. 



Senecio aureus was unintentionally omitted from the enumera- 

 tion of hosts of "Aecidium compositarum" in the provisional 

 list. Collections of aecia on this host have been made at Racine, 

 Radisson and Merrimack. 



According to the inoculation experiments of Fraser (Mycol- 

 ogia 4:236, 6:25) the Peridermium balsameum Pk. of the provi- 

 sional list is probably the aecial stage of Uredinopsis. There 

 seems to be no way at present of determining with which of the 

 five described species of Uredinopsis that occur in Wisconsin any 

 particular specimen of the Peridermium is connected. Fraser 

 has found that Calyptospora goeppertiana Kuehn also produces 

 a Peridermium on Abies balsamea. This rust probably occurs 

 also in Wisconsin but has not yet been collected. 



Caeoma abietis-canadensis Farl. has been shown by Fraser 



(Mycologia -9:188, 5:238, 6:21) to be the aecial form of a 



Melampsora on Populus grandidentata which does not produce 



aecia on Larix. Probably some, if not all, of the uredinia and 



telia collected in Wisconsin on this host are of this race. 



Entyloma lineatum (Cke.) Davis. Material that had been win- 

 tered out of doors was brought to germination in tap water slide 

 cultures early in May. The normal germination appears to be in 

 the sorus, isolated spores seldom germinating. The promycelium 

 is consequently long (usually 35-50/x) and is flexuose and irreg- 

 ularly nodulose, reminding one of the conidiophores of Ramu- 

 laria. The sporidia are borne in apical whorls of 2 to 4, are 

 fusoid — cylindrical, 7-14x2/*. The whorl of sporidia is detached 

 intact together with about an equal length of the distal portion 

 of the promycelium and then rises to the surface of the water in 

 the currents of which it revolves and moves in a very irregular 

 manner. This is the same method of detachment that takes place 



