346 MELAMPSORA 
on yellowish spots, about 1 mm. diam., surrounded by the 
epidermis, bright orange-yellow ; spores mostly roundish, 17— 
26 x 15—18 yw, densely verruculose. 
Uredospores. Sori of two kinds: (1) in summer and autumn 
on the leaves, hypophyllous, 4 mm. wide, on inconspicuous 
discoloured spots, (2) in spring, erumpent from the bark of 
young twigs and as much as 5 mm. long, afterwards on the 
young leaves, as much as 2 mm. long and densely crowded ; 
spores all similar, distinctly oblong, sometimes clavate or pyri- 
form, 20—36 x 11—17 4; epispore 2m thick, smooth above, 
distantly echinulate below ; paraphyses capitate, 50—70 x 15— 
20 », not thickened above, absent from the cortical sori. 
Leleutospores. Sori amphigenous, subepidermal, scattered 
thinly over the leaf-surface singly or in groups, dark-brown ; 
spores prismatic, rounded at both ends, clear-brown, 25—45 x 
7—10 4; epispore scarcely 1 thick, not thickened above, 
without evident germ-pore. 
Keidia on Allium ursinwm and other species; uredo- and 
teleutospores on Salix alba. 
The ceoma on Allium is indistinguishable from that of MM. Alli- 
fragilis or M. Altii-populina. This species can winter by its teleutospores 
which produce the ceoma on Alliwm, or by the perennial mycelium in the 
cortex of the branches on which the uredospores appear in spring before 
the cxzoma is produced; these sori are without paraphyses. The whole 
of this account is due to Klebahn: I have a specimen from Yorkshire 
(C. Crossland) which is referred, doubtfully, to this species. 
9. Melampsora arctica Rostr. 
MM. arctica Rostr, Fung. Groenland. 1888, p. 535. Sacc, Syll. Fung. 
vii. 595. Annals of Scott. Nat. Hist. 1911, p. 37. 
Uredospores. Sori hypophyllous, gregarious, yellow ; spores 
spheroid to ovoid, echinulate, 18—23 «; paraphyses clavate. 
Teleutospores. Sori hypophyllous, scattered, very small, 
dark-brown; spores prismatic, reddish-brown. 
On leaves of Salta herbacea, Scotland, Ben-an-Dothaidh, at 
3100 ft. (J. A. Wheldon and A. Wilson), 
