ON WILLOW 343 
torn epidermis, orange; spores roundish or subpolygonal, 18— 
20x 15—18; epispore about 3, thick, finely and densely 
verruculose, with a few thinner places (? germ-pores). 
Uredospores. Sori mostly hypophyllous, on conspicuous 
bright-yellow spots which show on both sides, 4—14 mm., 
pulvinate, surrounded by the torn epidermis, bright orange-red ; 
spores roundish, uniformly but not densely echinulate, 15—23 
x14—19.; epispore up to 24 thick, with a few thinner 
places; paraphyses variable, capitate or clavate, 40—70 x 12— 
21 w, not thickened above. 
Teleutospores. Sori amphigenous, but mostly hypophyllous, 
scattered or in little groups over the whole surface, subepider- 
mal, small, }—4 mm. diam., brownish-black; spores irregular, 
prismatic, rounded at both ends, 25—35 x 7—10p; epispore 
thin, clear-brown, not thickened above, without evident germ- 
pore. 
Ceomata on Ribes alpinum, R. Grossularia (not on R. 
nigrum, R. rubrum); uredo- and teleutospores on Salia pur- 
purea. 
Description according to Fischer ; Klebahn’s experiments have demon- 
strated the connection of the parasites on these hosts. It is probable that 
MM. Ribesit-auritae Kleb. is only a biological race of the same fungus, having 
spermogones and czeoma-spores (according to Klebahn) on Lubes nigrum 
as well as on the two mentioned above, and its other spore-forms on 
Salix aurita and possibly 8. Caprea. They are scarcely distinguishable, 
if at all, morphologically ; both may be British. 
M. Larici-epitea is also recorded on S. purpurea, but can be distin- 
guished by its densely clustered teleuto-sori on spots often bounded by 
veins, and the paraphyses of the uredo-sori strongly thickened above, 
M. mixta (Plowr. Ured. p. 289) may belong to either, but his species ex- 
tended to the branches and inflorescence. 
6. Melampsora Orchidi-repentis Kleb. 
Uredo confluens var. Orchidis A. et 8. Consp. p. 122, Cooke, Handb. 
p. 527. 
U. Orchidis Mart. Flor. Mosq. p. 229. Cooke, Micr. Fung. p. 216. 
Caeoma Orchidis Wint. Pilze, p. 256. Plowr. Ured. p. 261; Gard. 
Chron. 1890, viii. 41. Sacc. Syll. vii. 868. 
Melampsora Orchidi-repentis Kleb. in Pringsh. Jahrb. f. Wissensch. 
Bot. 1900, xxxiv. 369. Fischer, Ured. Schweiz, p. 488. 
