342 MELAMPSORA 
4, Melampsora Ribesii-viminalis Keb. 
Caeoma Ribestt Link, Sp. Pl. ii. 28 p.p. 
Melampsora Ribesii-viminalis Kleb. in Pringsh. Jahrb. f, Wissensca. 
Bot. 1900, xxxiv. 363. Fischer, Ured. Schweiz, p. 494. 
Spermogones. Pulvinate, with flat hymenium. 
Aicidiospores. Czeomata hypophyllous, on discoloured spots 
which show on both sides, arranged in groups, 1°5 mm. wide, 
bright-orange ; spores roundish, rarely oval, 18—23 x 14—17 p; 
epispore 2—4 4 thick, with many thinner places (? germ-pores), 
finely and densely verruculose. 
Uredospores. Sori hypophyllous, minute, about +mm., 
scattered or in groups, pale orange-yellow ; spores more or less 
round, 15—19 x14—16 yp; epispore 2 w thick, uniformly echinu- 
late; paraphyses capitate or more often clavate, hardly thick- 
ened above, 50—70 x 18—25 p. 
Teleutospores. Sori epiphyllous, developed between the 
cuticle and the epidermis, }—4 mm., scattered or in groups 
over the whole leaf, dark-brown, shining; spores prismatic, 
rounded at both ends, more or less irregular, 25—40 x 7—14p; 
epispore thin, clear-brown, not thickened above, with no evident 
germ-pore, 
Ceomata on Ribes Grossularia, R. mgrum, R. rubrum; 
uredo- and teleutospores on Salix viminalis. 
Klebahn showed, by many trials, the genetic connection of the parasites 
on these species. The teleutospores can be distinguished from all others 
except those of M. Larict-Caprearum and M. Allii-Galanthi-fragilis by 
their being subcuticular. M. Larici-epitea is also recorded for Salix 
viminalis, but that has its teleutospores subepidermal, and the paraphyses 
of the uredo-sori strongly thickened at the apex. The ceoma on Ribes 
does not seem to be recorded for this country and is apparently rare. 
5. Melampsora Ribesii-purpuree Kleb. 
Melampsora Ribesii-purpureae Keb. in Pringsh. Jahrb. f. Wissensch. 
Bot. 1901, xxxv. 667, Fischer, Ured. Schweiz, p. 492. 
Spermogones, Subconical, with flat hymenium. 
Aicidiospores. Cxeomata mostly hypophyllous, on pale-yellow 
spots which show on both sides, scattered or in subcircinate 
groups, 4—14 mm., sometimes confluent, surrounded by the 
