346 



MELAMPSORA 



• Hi yellowish spots, about 1 mm. diam., surrounded by the 



epidermis, bright orange-yellow: spores mostly roundish, 17— 

 26 x 15 — 18 fx, densely \erruculose. 



Uredospores. Sori of two kinds: (1) in summer and autumn 

 on the leaves, hypophyllous, h. mm - vvide, 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 — 36x11 — 17 yu,; epispore 2yu, thick, smooth above, 

 distantly echinulate below : paraphyses capitate, 50 — 70 x 15— 

 20 fx, not thickened above, absent from the cortical sori. 



Teleutospores. 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 /x ; epispore scarcely 1 fx, thick, not thickened above, 

 without evident germ-pore. 



iEcidia on Allium ursinum and other species; uredo- and 

 teleutospores on Salix alba. 



The cseoma on Allium is indistinguishable from that of M, Allii- 

 fragilis or M. Allii-populina. This species can winter by its teleutospores 

 which produce the cseoma on Allium, or by the perennial mycelium in the 

 cortex of the branches on which the uredospores appear in spring before 

 the cseoma is produced ; these sori are without paraphyses. The whole 

 of this account is due to Klobahn : I have a specimen from Yorkshire 

 (C. Crossland) which is referred, doubtfully, to this species. 



9. Melampsora arctica Rostr. 



M. arctica Rostr. Fung. Greenland. 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 Salix herbacea, Scotland, Ben-an-Dothaidh, at 

 3100 ft. (J. A. Wheldon and A. Wilson). 



