412 



THE KUSTS UF NOVA SCOTIA. — FRASEK. 



111. Telia amphigenous, mostly on culms, sheaths and 

 infloresenee, oblong or linear, often confluent, black, soon 

 naked, surrounded by the ruptured epidermis, pulvinate. 

 Teliospores oblong-clavate, oblong-fusiform, narrowly obovate 

 or sometimes ellipsoid, 16-22 by 22-G8/x; apex rounded, obtuse 

 or conical, base narrowed, sometimes rounded, usually some- 

 what constricted at the septum; wall chestnut-brown, apex 

 darker, thickened 8-10/t, smooth ; pedicel coloured, firm, usually 

 as long as the spore, sometimes short. 



Aecia on Berheris 

 vulgaris L. (cultivated), 

 Truro. 



TJredinia and telia 

 on Agropyron vulgare 

 L., A. repens Beauv., 

 A vena sativa L., Agros- 

 tis alba L., Pictou, 

 Truro; Hordeum juha- 

 ium L., Pictou; Secale 



Teliospores of Puccinia pramiyiis. CCTCale, Truro. 



Puccinia graminis is found on a large number of grasses. 

 By infection experiments Ericksson showed that it consists of 

 a number of specialized fomis, all having their aecia on the 

 barberry, but nevertheless not capable of infecting one another. 

 As a result of experiments so far conducted, the following 

 forms have been indicated: 



1. Secalis, on Rye (Secale cereale) and other hosts. 



2. Avenae, on Oats (Avena sativa). 



3. Airae, on Airia. 



4. Agrostidis, on Agrosiis. 



5. Poae, on Poa. 



6. Tritici, on Wheat (Triticum vulgare). 



