1890.] occurring in the Nelyhhourhood of Simla. 109 



b. MICROPUCCINIA, Schroter. 

 6. Pdccinia Leptodermis, nov. sp. 

 On Leptodermis lanceolata, Wall. 

 For description see above under Melampsora Leptoder^nis, 



7. PucciNiA Wattiana, nov. sp. 

 On Clematis puherula, H. f. and T. 



This fungus was collected by Dr. George Watt in the Sutlej valley, 

 near Suni, 2,500 ft., in October 1889. The leaves were covered with 

 blackened, more or less circular patches, on the under surfaces of which 

 were numerous dark brown pustules, with a marked circinate arrange- 

 ment : a few pustules, however, were found also on the upper leaf surface. 

 The blackened areas of discoloration measured 3 — 4 m.m. in diameter, 

 and each leaf bore numerous such patches, from 5 to 30. Some pustules 

 were also discovered on the petioles and ultimate stems. 



The spores are readily detached, coming off with a considerable 

 portion of stalk adhering. They are deep chestnut brown, smooth on 

 the surface, rounded at both ends, with little constriction at the septum, 

 and often presented a small colourless mammilla at the free end, which 

 is not otherwise thickened. Spores were often seen divided into 3 and 

 even 4 cells, and a few were single celled. There were no uredospores. 

 The spores measured, when just moistened 42 — 37 x 21 — 20 /x. 



The spores, which had been preserved in situ in ordinary botanical 

 drying paper, were placed in water on the 4th May 1890, and on the 

 following day they were found to have germinated freely. The pro- 

 mycelia are usually quite short, though sometimes long, and are colourless. 

 It is remarkable that whilst the upper promycelium issues from the 

 apex as usual, the lower one is emitted from a point close to the stalk. 

 The sporidia are oval and colourless, measuring 15 — 14 x 8 — 7/x,, 

 and are borne on short sterigmata. No secondary sporidia were formed. 



Memarhs. — Saccardo mentions 2 species of Puccinia on species of 

 Clematis, viz., P. stromatica, Berk, et Curtis, and P. irisidiosa, Berk. 

 In the absence of measurements it is impossible to determine whether 

 the species I have described is identical with either. The general 

 characters of the spores of P. insidiosa are unlike those I have described. 

 The spores of P. stromatica are somewhat similar; but the sori are 

 said to be diffuse and ruddy. I am inclined to think that the species 

 I have described is distinct, and I have named it after Dr. G. Watt. I 

 regret being unable to give figures of the spores, as 1 obtained the 

 specimens after this paper had been sent to press. 



