354 I'HE RUSTS OF X(JVA SCoTlA. FilASER. 



On Vaccinium, Pennsylvanicum Lam., Pictou, Oct. 4, 1910. 



Arthiir in the "North American Flora" describes the telia 

 as hypophyllous, and the teliospores as oblong or columnar 

 and 7-10 by 14-17^. There is a marked difference in the 

 position of the telia and the size and shape of the teliospores 

 of my collections from this description. The nredinia agree 

 with Arthur's description. 



The rust is incon=;picuous and, though only a few collec- 

 tions were made, it will probably be found to be common. 



The aecial stage of this rust is doubtless the Peridermium 

 50 common on Tsiiga cnnndensis which has been confused with 

 Peridermium Peckii. Clinton (Keport Conn. Agric. Exper. 

 Station for 1909-1910, page 719) has connected this rust with 

 Peridermium Peckii, but it is probable his aecia are the most 

 common form Avhich have been confused with the true Peckii. 

 The aecia, which doubtless belong to this species, were found 

 to l>e very common at Truro, Oakfield and Pictou, and the 

 field evidence was very strong that they were connected with 

 this rust. Collections sent to Dr. Arthur were regarded as 

 distinct from Per. Peckii. 



Pucciniastruni Pyrolae (Pers.) Diet. 

 k 1. Pycnia and aecia unknown. 



II. Uredinia ampliigenous, on small reddish spots, small, 

 scattered or grouped, mammillose, yellowish-red, dehiscent by 

 a central pore, long covered by the overarching epidermis; 

 peridium hemispherical, cells elongated vertically below, 

 os'tiolar cells large, c-chinulate. Urediniospores oblong or 

 ellipsoid, 1-3-10 by 24-3r)iti; wall colourless, rather thick, 

 minutely and sparsely echinnlate; contents orange-yellow when 

 fresh. 



III. Telia hypophyllous, adjoining uredinia, inconspicu- 

 . ous, subepidermal, an even layer of laterally flattened cells. 



Teliospores oblong or columnar, 10-12 by 24-28/a; wall uni- 

 formly thin, colourless. 



