ON POPLAR 



347 



1 'hints of the Salix were brought from Scotland and cultivated at 

 Walton, near Liverpool ; there were then uredospores only. When the 

 leaves fell, they were left on the ground, and two teleuto-sori were developed 

 on them, of a rufous black colour. I have not seen the specimens. 



10. Melampsora populina Lev. 



Melampsora populina Lev. Ann. Sci. Nat. 1847, p. 375. Cooke, 

 Handb. p. 523 ; Micr. Fung. p. 219. Plowr. Ured. p. 242. Sacc. 

 Syll. vii. 590. 



(1) Melampsora Allii-populina Kleb. 



Caeoma Alliorum Link ; Plowr. Ured. p. 261 p.p. 

 M. populina Cooke, Micr. Fung. pi. 9, f. 195, 196. 



Melampsora Allii-popxdina Kleb. in Zeitschr. f. Pflanzenkr. 1902, xii. 

 25. Fischer, Ured. Schweiz, p. 504. 



Spermogones. Pulvinate, projecting. 



sEcidiospores. Cseomata about 1 mm. wide, mostly in 

 groups on yellowish-white spots on the leaves, surrounded by 

 the epidermis, bright orange-red ; spores roundish or oval or 

 polygonal, 17 — 23x14 — 19 pu; epispore about 2 p, thick, but 

 sometimes thicker and then obviously thin at certain spots 

 (? germ-pores), verruculose. 



Uredospores. Sori hypophyllous, or even rarely epiphyllous, 

 round, scarcely 1 mm. wide, surrounded by the epidermis, 

 causing yellowish spots, bright reddish-orange; spores distinctly 



Fig. 260. M. Allii-populina. a, teleutospores ; b, paraphysis ; c, uredospores. 



On Populw nigra. 



oblong or clavate, rarely oval, 24 — 38x11 — 18//,; epispore 

 2 — 4/i thick, with sunken places (? germ-pores), sometimes 

 thicker at one end, but without any equatorial thickening, 

 distantly echinulate, but smooth above ; paraphyses mostly 

 capitate, 50 — 60 x 14 — 22 u, with a wall uniformly 2 — 3 p, 

 thick. 



