88 A. Barclay — A Descriptive List of the Uredineae [No. 2, 



3. Melampsora Salicis CArRE^?, (Pers). ? 



On Salix, sp. 



In April I found this host attacked by a uredo-bearing fungus, but 

 by no means largely. Young shoots were attacked, and in such cases 

 every leaf bore beds. The uredo pustules were extremely numerous on 

 each leaf, and on the lower surface mostly, with only a few on the upper 

 sui'face. These are round or oval and prominent (hemispherical). The 

 spores are pale yellowish orange, and very deciduous, and each pustule 

 contained club-shaped paraphyses (fig. 8, PI. I). The spores were very 

 uniform in size and round, measuring 20/jl in diameter when examined 

 fresh. The epispore is coarsely tuberculated and the contents granular. 

 I placed these spores in water in a watch glass, but they did not germi- 

 nate. 



After this I lost sight of the fungus until July, when I saw the 

 same host in the same locality much more extensively attacked, probably 

 by the same parasite. Now the leaves were more generally attacked, 

 not as before only leaves on particular shoots. The leaves exhibited 

 patches of discolouration, blackish brown in the centre with a surround- 

 ing zone of brownish red, and lastly the whole surrounded by an irregu- 

 lar zone of pale yellow. On the lower surfaces of such patches spore 

 beds were erupted. On the blackish centre there was usually a central 

 pustule, surrounded by a circlet of others ; and beyond this circle, and 

 outside the blackish centre, irregularly disposed small yellow pustules. 

 The spore beds everywhere contained the same uredospores, with very 

 large club-shaped paraphyses surrounding the base, and sparsely also 

 among the spores. A uredo bed may often be seen in the middle of 

 teleutospore beds. The uredospores are not given off in chains but are 

 borne singly on stalks (fig. 8, PI. I). These spores are oval, and beset 

 sparsely with coarse spines, The fresh spores measure 28 X 22/x, on an 

 average. The heads of the paraphyses are smooth. 



Again in September I found the leaves bearing teleutospore fructi- 

 fication. The leaves were now speckled irregularly on their lower sur- 

 faces with orange red spots, mostly round but sometimes of an irregular 

 shape from the coalescence of pustules. With a field lens a central 

 cushion of spore beds may be seen, about 2 to 3 m.m. in diameter. On 

 the upper leaf surface these invaded areas are dark red and very conspi- 

 cuous. Individual leaves are often very extensively attacked. The 

 central spore cushion contains uredospores with extremely large capitate 

 paraphyses. The spores are very pale yellow and echinulate, oval to 

 round, 23/u. in diameter to 26 X 21/*. The heads of the paraphyses 

 measured 27/x in breadth by 34/x in length. The teleutospores in 

 mounted specimens, after treatment with alcohol, measure from 34 to 

 54/j. in length and 8/x in bi^eadth. 



