364 A. Barclay— JDi5^ of the Uredinea© occurring [No. 3, 



stellate manner. Spermogonia exist only on the upper surface, pre- 

 ceding the appearance of the aBcidia by a very short time — indeed, 

 while ripe spermogonia exist on the upper surface of a patch, young 

 unopened secidia may also be found on the lower surface of the same 

 patch. 



The mycelium^ which ramifies between the parenchyma cells, is 

 colourless. The bases of the spermogonia extend to the inner level of the 

 palisade cells, and the bases of the secidia from the other side reach 

 down to the same point. The spermogonia measure about 126 /x. in 

 depth and 157 ft in breadth, and have a tuft of paraphyses projecting 

 from the mouth to about 63 /x. 



The peridium consists of a single layer of flat cells, more or less 

 hexagonal and measuring about 26 x 22 /a (Fig. 2, PL XIV.). These cells 

 are thick- walled and contain some yellow oil globules in their 

 cavities. 



The cecidiospores, after lying a few minutes in water, measured 

 26'2 X 20*2 fx on an average. Their contents are of a brilliant orange- 

 yellow colour, and they have a thin epispore without any markings 

 (Fig. 3, PL XIV.). I did not succeed in observing their germination, as 

 they steadily refused to grow in water. The only other species of Jas- 

 mine common in Simla is /. officinale, L., but this host nevers bears an 

 ^cidium, although the closely related /. grandijiorum, L., which grows 

 at considerably lower elevations, harbours a very distinct and peculiar 

 one, which I hope to describe later. 



10. — MoNOSPORiDiuM Euphorbia, gen. et sp. nov. 



Euphorbia cognata, Klotzscli. 



Towards the end of July and during the first half of August, a very 

 peculiar JEcidium on this plant presenting some very unusual charac- 

 ters is not uncommon ; and some individual plants are very extensively 

 attacked. Only the leaf blades are attacked, so far as I have observed, 

 and a single leaf may exhibit from one to six patches of invasion. 

 These patches are circular and rosy red above with a broad and irre- 

 gular halo of paled yellowish tissue around them, the paling increasing 

 in area as the patch grows older (Fig. 4, PL XIV.). On the under sur- 

 face the patch is quite white and cushion like (convex). When very 

 young, this cushion on the lower surface of the leaf is uniformly con- 

 vex, and with a field lens a few pellucid spots may be seen in its centre, 

 which are spermogonia. Later, as the spermogonia wither, a very dis- 

 tinct pit or depression is formed in the centre of the cushion, and, while 

 this central pit enlarges in area, so the circular cushion surrounding it 

 becomes more and more prominent and whiter. At last the central pit 



