ON WILLOW 345 
Spermogones. Scarcely projecting, with flat hymenium. 
4icidiospores. Ceomata on the leaves and stems, also on 
the bulbils, clustered on discoloured spots, usually oblong, up 
to 2mm. long, surrounded by the torn epidermis, bright orange- 
yellow; spores irregular, mostly polygonal, seldom round, 18— 
25 x 12—19 w; epispore 1—1$ w 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—83 x 13—15y; epispore 
up to 3 thick, with thinner places (? germ-pores), distantly 
echinulate, but smooth and somewhat thinner above; paraphyses 
capitate or clavate, 50—70 x 15—20 yy, with thin pedicel and 
uniformly thickened membrane (3—5 yp). 
Teleutospores. Sori chiefly epiphyllous, between the cuticle 
and the epidermis, scattered or in groups, pulvinate, 1—14 mm. 
broad, dark-brown, shining; spores -prismatic, rounded at both 
ends, 30—48 x 7-144; epispore clear-brown, uniformly thick 
(about 1), without evident germ-pore; basidiospores orange. 
Ceomata on Allium Cepa, A. ursinum and others; uredo- 
and teleutospores on Salia fragilis, S. pentandra, and the 
hybrid between them. 
The teleutospores germinate after a winter’s rest. Klebahn’s J. 
Galanthi-fragilis is morphologically identical, even occurring on the same 
species of Salix, but has its ceomata 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 ceomata 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. Larici-pentandrae Kleb. ; 
8. Melampsora Allii-Salicis-albe Kleb. 
Melampsora Altii-Salicis-albae Kleb. in Zeitschr. f, Pflanzenkr. 1902, 
xii. 19. Fischer, Ured. Schweiz, p. 480. 
Spermogones. Rather flat. 
Acidiospores. Ceomata on the leaves and stems, in groups 
