PUCCINIA 307 



Uredo sori minute, yellow-brown, densely crowded on the 

 leaves, more scattered on the inner surface of the glumes ; 

 spores globose or broadly elliptical, spinulose, yellow, 25-30 \x 

 diam. 



Teleutospore sori forming crowded blackish streaks on the 

 leaf-sheaths, more scattered on the inner surface of the 

 glumes, encircled with curved, brownish paraphyses ; spores 

 unsym metrical, apex flattened or with 1-2 blunt prominences 

 30-40 [x long, basal cell 9-12 /x wide, terminal cell 16-24 l x 

 wide ; promycelial contents yellow. 



Puccinia simplex (Eriks. and Henn.) produces uredo 

 and teleutospores on leaves of barley. Aecidium unknown. \ 



Uredo sori very minute, up to o'5 mm. long, sparing, 

 scattered on upper side of leaves, citron-yellow ; spores 

 globose or shortly elliptical, spinulose, yellow, 19-22 //. diam., 

 or 22-27 x 15-19 /* 



Teleutospore sori very minute, blackish, scattered on the 

 leaves, somewhat longer on the leaf-sheath, surrounded with 

 brown paraphyses ; spores stipitate, mostly i-celled, unsym- 

 metrical, 24-30 x 16-18 /*, rarely 2-celled, clavate, apex blunt 

 or narrowed, 40-48 \i long, basal cell 16-18 yu broad, terminal 

 cell 19-24 /x broad. 



Puccinia phlei-prate?isis (Eriks. and Henn.) occurs in a wild 

 state on timothy grass (P/i/eum pratense), but artificial infec- 

 tion has shown that it can infect cultivated cereals. The 

 aecidium stage is unknown. 



Uredo sori often crowded, yellowish-brown, 1-2 mm. long, 

 on leaf-sheath and culm ; spores oblong or pear-shaped, 

 spinulose, dirty yellow, 18-27 x 15-19 /x. 



Teleutospore sori blackish, on leaf-sheath and culm, 

 2-5 mm. long ; spores fusiform or club-shaped, constricted at 

 the septum, chestnut-brown, apex rounded or narrowed, wall 

 much thickened, 38-52 x 14-16 /u. 



Brachypuccinia. Spermogonia, uredospores and teleuto- 

 spores produced on the same host, aecidia absent. 



Celery rust {Puccinia bullata, Winter) forms small warts 

 on the leaves of celery, parsley, dill, and on several wild 

 umbelliferous plants. When the epidermis is ruptured the 

 spore-mass is brown. The fungus is destructive when present 

 in quantity. 



Spermogonia arranged in rounded groups. 



