362 A. Barclay — List of the Uredineae occurrhig [No. 3, 



(^c. leucospermum, D, C.) having white spores. Althongli I have 

 carefully searched for teleutospores on A. rivularis in Simla, I have 

 never found them, and I am therefore constrained to call this ^cidium 

 ^c. leucospermum in the meantime. Schroter, I understand, thinks 

 the teleutospores on A. nemorosa are related to the ^cidium borne on 

 the same host, whilst Fuckel relates the ^cidium on A. ranunculoides 

 with the teleutospores borne on it. The Himalayan ^Ecidium would 

 appear to throw some doubt on the connection between their teleutos- 

 pores {Puccinia fusca^ Relhan) and the two secidia, or, at any rate, if 

 that be indisputable, the Himalayan ^cidium must be entirely different, 

 being most probably a heteroecious Uredine. 



8. — ^^ciDiuM Thalictri flavi, D. C. ? 



Thalictrum Javanicura, Blume. 



The ^cidium on this plant, as in the case of that just described 

 on Anemone, is remarkably localised, although the host is widely 

 diffused. It is therefore a rare parasite, although, in the localities in 

 which it is found, it occurs abundantly enough. It is met with during 

 the rains, in July, while the plant is flowering. Only the leaf blades are 

 as a rule affected, but occasionally the petiole is also attacked, when it is 

 considerably hypertrophied and distorted. Fig. I, PI. XIV. represents 

 the petiole attacked in two places : in both cases it will be seen that 

 the petiole has become considerably elongated and in one case also bent 

 completely round through 360°. When the parasite attacks the leaf 

 blades, little reddish yellow spots are formed as seen from above, 

 measuring ordinarily from a minute point to 4 or 5 m.m. in diameter. 

 Sometimes, however, the patches are much larger — in one case 1 c. m. in 

 diameter — and then the leaf is considerably distorted, especially when 

 a main vein is involved. These larger patches are reddish brown 

 above. The attacked areas are generally convex above at first, but 

 often, as the area becomes larger, the converse obtains. The patches 

 are frequently placed over a prominent vein, which is then, within the 

 affected area, considerably swollen. The number of patches on a single 

 leaflet varies from one to twelve or perhaps more. These attacked 

 areas on the leaf blade are considerably thickened : the normal thick- 

 ness of these delicate leaves is 0"095, m.m., whilst near a young still im- 

 mature aecidium it was found to be 0"410 m.m. 



Spermogonia are formed abundantly both on the upper and lower 

 surfaces, and to the naked eye appear as minute pellucid reddish yellow 

 spots. They are of the usual structure, measuring about 63 to 80 [x in 

 depth and 75 to 94 /t in width. These structures are well sunk into 

 the leaf tissue. Their mouths are surmounted by a tuft of paraphyses 



