Gramineae. 123 



Elymus. 



44. Puccinia impatientis (Schw.) Arthur. 



Arthur, Bot. Gaz. XXXV., p. 19 (1903). 

 Sydow, Mon. Ured. L, p. 751 (1903). 



Aecidium impatientis Schw. 



II. Uredosori epiphyllous and occasionally hypophyllous, scattered or 



arranged in lines and confluent, oblong, 1-1 J mm. long, pulvinate, 

 erumpent, powdery, reddish-brown. 



Uredospores bright orange, subglobose or ellipsoid, finely 

 echinulate, up to six scattered germ-pores on one face, 25-33 x 

 18-23/i. 



III. Teleutosori hypophyllous, greyish -black, pulvinate, long covered by 

 epidermis, densely crowded, linear, often confluent and arranged in 

 lines between the veins, with dark-brown paraphyses in clusters. 



Teleutospores brownish, oblong to oblong-clavate, smooth, 

 slightly constricted at septum, 35-55 x 16-22 p, average 

 40 X 16 IJL upper cell rounded or truncate, and thickened at 

 apex (3-5 p) ; lower cell generally paler in colour, and rounded or 

 attenuated at base ; pedicel very short, hyaline or tinted, but 

 dark-brown at apex. 



X. Mesospores not uncommon, pale brown, slightly thickened at apex, 

 elongated, oblong, or obovoid, 29-35 x 12-17 p.. 



On living leaves of Elymus condensatus Presl. 

 Victoria Rutherglen, Dec., 1903. 



The seed of this grass was obtained from the United States, and the 

 rust was doubtless imported with it. 



Arthur sowed germinating teleutospores from Elymus virginicus L. on 

 Impatiens aurea MuhL, and in fifteen days aecidia were produced. This 

 result was confirmed in the succeeding year. 



Specimens on E. virginicus, from Iowa, in Sydow's Ured. Exs. 1380, are 

 labelled Puccinia rubigovera (DC.) Wint., and agree with this species. 



There is another Puccinia on the same host plant (P. procera Diet, and 

 Holw.), and according to the description it is quite distinct. The 

 uredospores are 32-45 x 30-38 ^ and the teleutospores 45-100 ju long. 



P. montanensis Ellis also differs in the teleutospores being stouter and 

 broader, sometimes reaching a breadth of 26 p. 



(Plate III., Fig. 26.) 



Lolium. 

 45. Puccinia lolii Niels. 



Nielsen in Ugeskrift for Landmaend. I., p. 549 (1875). 



Sydow, Mon. Ured. I., p. 704 (1903). 



Sacc. Syll. XL, p. 203 (1895). 



P. coronifera Klebahn, Zeitschr. f. Pflanzenk. II., p. 340 



(1892). 



II Uredosori on upper and under surfaces of leaves, forming blister- 

 like swellings, oval or linear, orange, soon bursting through epider- 

 mis, pulverulent, often confluent, sometimes up to 2 mm. long. 



