ON WILLOW 345 



Spermogones. Scarcely projecting, with Hat hyrnenium. 



/Eddiospores. Cseomata on the leaves and stems, also on 

 the bnlbils, clustered on discoloured spots, usually oblong, up 

 to 2 mm. long, surrounded by the torn epidermis, bright orange- 

 yellow : spores irregular, mostly polygonal, seldom round, 18 — 

 25 x 12 — 19 fi\ epispore 1 — H/a thick, finely verruculose. 



Uredospores. Sori hypophyllous or partly epiphyllous, 

 minute, ^ mm., circular, surrounded by the torn epidermis, 

 reddish-orange, causing reddish-yellow spots on the upper side ; 

 spores distinctly oblong or obovate, 22 — 33x13 — 15/^; epispore 

 up to 3 jx thick, with thinner places (? germ-pores), distantly 

 echinulate, but smooth and somewhat thinner above; paraphyses 

 capitate or clavate, 50 — 70x15 — 20^, with thin pedicel and 

 uniformly thickened membrane (3—5 fx). 



Teleutospores. Sori chiefly epiphyllous, between the cuticle 

 and the epidermis, scattered or in groups, pulvinate, \ — H mm. 

 broad, dark-brown, shining ; spores prismatic, rounded at both 

 ends, 30 — 48x7 — 14 //, ; epispore clear-brown, uniformly thick 

 (about 1 fi), without evident germ-pore ; basicliospores orange. 



Cseomata on Allium Cepa, A. ursinum and others; uredo- 

 and teleutospores on Salix fragilis, S. pentandra, and the 

 hybrid between them. 



The teleutospores germinate after a winters rest. Klebahn's M. 

 Galanthi-fragilis is morphologically identical, even occurring on the same 

 species of Salix, but has its cseomata on Galanthus nivalis ; it can only be 

 considered as a biological race. The same author's M. Larici-pentandrae 

 infests the same species of Salix, but has its eteomata on Larix ; it is 

 distinguished, however, by its teleuto-sori, which occur on both sides of 

 the leaves, are more minute (though often confluent) and arise below the 

 epidermis. I have a Melampsora on Salix fragilis, which has minute 

 teleuto-sori abundantly on the upper surface and beneath the epidermis. 

 This might belong to M. Lariei-pentandrae Kleb. 



8. Melampsora Allii-Salicis-albae Kleb. 



Melampsora Allii-Salicis-albae Kleb. in Zeitschr. f. Pflanzenkr. 1902, 

 xii. 19. Fischer, Ured. Schweiz, p. 480. 



Spermogones. Rather flat. 



sEcidiospores. C*omata on the leaves and stems, in groups 



