416 THE RUSTS OF NOVA SCOTIA — FKASER. 



naked, black. Teliospores oblong or clavate, lG-22 by 38-68/i, 

 apex with projections, erect or inclined, often crown-like, base 

 narrowed; wall thin, thickened somewhat at apex, brown, 

 darker at apex; pedicel short, thickened, sometimes absent. 



On Calamagrostis canadensis (Michx.) Beauv.. Picton. 



The aecia of this species is on Ehamnus alnifoUa L'Her. 



Puccinia coronata Corda was the name formerly given to 

 the species occurring on oats (Avena satlva) and other grasses, 

 with teliospores provided with a cro^ni of j)rocesses and called 

 the cro\\Ti ru?t. Klebahn, by culture experiments, found 

 that teliospores from some of these grasses produced aecia 

 only on Ehamnus frangula, while teliospores from others 

 j)roduced aecia only on Ehamnus cathartica. This showed 

 that two species were included under P. coronata. Klebahn 

 gave the name P. coronifera to the rust producing aecia on 

 Ehamnus cathartica and the original name was retained for 

 the rust producing its aecia on Ehamnus frangula. Later, on 

 the basis of priority, the name P. Lolii Neils has replaced 

 Klebahn's P. coronifera. 



Ericksson has shown that this species, P. coronata Corda, 

 as limited by Klebalm, consists of several biological forms: 



1. Calamagrostidis. 



2. Phalariclis. 



3. Agrostidis. 



4. A gropyri. 

 ^. Hold. 



0. Epigaei. 



Arthur sowed teliosporic material, part of the Pictou 

 collections, on Ehamnus fraAigula with abundant infection. 

 (See Arthur Mycologia 4:18. 1912). 



Puccinia Maydis Bereng. 



Puccinia SorgJii Schw. 

 Puccinia Zeae Rabh. 



