THE RUSTS OF NOVA SCOTIA. FHASEK. 



7. Teliospoi-es of Melatnpsoro&is 

 , ledicola, one germinating, 



The connection of the aecial stage, Peridermium decolorans 

 Pock, and the telial form on Ledum, was shown by cultures 



in 1910 by the writer. (See 

 Mycologia 3 : TO. 1911). The 

 germinating teliospores of the 

 rust on Ledum were sown on 

 Picea canadensis and abundant 

 pycnia and aecia developed. 



The aecial stage is very 

 abundant about Pictou and 

 doubtless throughout the prov- 

 ince. The aecia begin to mature 

 about the first of July. The 

 telial stage is also common. The teliospores begin to germinate 

 about the first of June, and when germinating are quite con- 

 spicuous. The uredinia Avere rare, only one collection being 

 made. 



The urediniospores and especially the teliospores are much 

 larger than the measurements given in the "North American 

 Flora" by Arthur. 



Melampsoropsis Cassandrae (Peek & Clinton) Arth. 

 Chrysomyxa Cassandrae Tranz. 



0. Pycnia amphigenous, numerous, scattered, conspicuous, 

 punctiform, honey-yellow, becoming blackish-brown. 



T. Aecia chiefly hypophyllous, in two irregular rows on 

 yellowish spots occupying part or all of the leaf, flattened 

 laterally, .5-1.5 mm. long, .5-. 8 mm. high, dehiscent at the 

 apex; peridium colourless, rather delicate, cells slightly over- 

 lapping. Aeciospores broadly ellipsoid or globoid, 17-24 by 

 24-33/A; wall colourless, medium thick, moderately and densely 

 verrucose. 



TT. Uredinia hypophyllous in small groups; peridium 

 inconspicuous, delicate. Urediniospores catenulate. elliptical, 



