224 A. Bai'clay — Additional TJredineae /rom Simla. [No. 3, 



were almost wholly covered with brilliant orange red pustules, minute 

 and discrete, though from their enormous numbers they at first sight 

 appeared to be coalescing. The upper leaf surface is profusely flecked 

 with yellow discoloured spots. The spores are orange red, thick walled, 

 spiny, and measure when just wetted 24 — 21 x 18 — 16/a. There 

 were no teleutospores. 



It is impossible from the uredo spores alone to determine the exact 

 position of this fungus. Possibly it is M. aecidioides which occurs also 

 on Populus alba. The uredospore measurements coincide very closely 

 with those I have just described, but M. aecidioides has paraphyses 

 whilst the Himalayan form has not. 



ISOLATED AECIDIA. 



Aecidium Cunninghamianum, n. s. 



On Cotoneaster hacillaris, Wall. 

 I found the leaves of this plant bearing sevei^al characteristic 

 Boestelia patches first on the Mahasu hill by the road side ; then fairly 

 abundantly in Narkanda; and lastly, scarcely in Mashobra. These were 

 found at the end of August. In all these localities, especially Narkanda 

 and Mashobra, I did not see a single Gupressus tree, and this inclines me 

 to regard the fungus as distinct from Gymnos'porangiura Gunningliami- 

 anum, mihi. The leaf patches were red above, with long filiform peridia 

 on the lower surface, about 3-5 mm. in length. From one to five such 

 patches were found on a single leaf. On superficial examination this 

 fungus looks diifereut from Gymnosporangium Gtmninghamianum, al- 

 though the peridium bursts in the same way, namely, by irregular 

 slits on the tube sides. With a field lens numerous spermogonia could 

 be seen on the upper leaf surface. 



The aecidiospores are yellowish brown, round or oval, densely 

 beset with minute and very shallow warts, and with apparently numer- 

 ous germ pores (the addition of sulphuric acid discloses eight pores). 

 These spores measure 28 - 26 x 28 - 2V (PI- I"^, %• 7) The peridial 

 cells are paler in colour than the aecidiospores, elongated, separating 

 readily from one another laterally, very spiny (not ridgy), and measui^e 

 from 6U — 58 X 26 — 24yu, (PL IV, fig. 7). The aecidiospores would 

 not germinate in water. 



Had it not been for the absence, as far as I could see, of Gupressus 

 trees in the neighbourhood of these aecidial patches, I should have been 

 disposed on the whole to regard this fungus as G. CunningJiamianum ; 

 and, indeed, this identity is still quite possible, since it is by no means 

 easy to be certain that no Cypress tree exists in the forests in those 



