1889.] 



occurring in the neighhourliood of Simla. 



233 



Lave not attempted the same subdivision in List 11., because I am by no 

 means sure that uredospores are not produced in those cases in which 

 I do not happen to have found them. 



List L 

 a. (Leptopuccinia). 



1. PucciNiA. Rosa:, nov. sp. 

 on Rosa macrophylla, Lindl. 



This curious fangus does not occur in Simla, but is abundant at 

 Narkanda, some forty miles distant from Simla towards the interior. It 

 is curious in several respects. In the first place the mycelium pervades 

 the whole of the tissues of the shoots attacked, and almost every leaf 

 in such a shoot bears spores. The affected shoots are paler in colour 

 than normal and somewhat hypertropliied. 



All attacked leaves are discoloured and much smaller and thicker 

 than the normal oues. The diminished size is due to the fact that 

 apparently only the young leaves are attacked and, when attacked, ai'e 

 arrested in growth. Another peculiarity in this fungus is that, when the 

 spores are formed, the whole affected part of the plant has a most offensive 

 foetid smell, which I can only compare with the smell of the stalk of 

 flowers of certain Ariscema. It is a smell which suggests the attraction 

 of flies to the part ; but I never actually saw flies thus attracted. The only 

 other Puccinia emitting a powerful odour with which I am acquainted is 

 P. suaveolens, (Pers.), and this fungus likewise gives rise to deformity 

 in the host's tissues. The fungus is so far away from Simla that I have 

 Lad no opportunity for closely studying it. The mycelium appears to be 

 perennial, but I Lave not been able to prove this. The teleutospoi-e 

 pustules are large, brown, and powdery, the spores being very deciduous, 

 breaking off from their beds with only a fragment of stalk adliering to 

 them. This fungus is met with in May and June: after that the parts 

 bearing the fungus wither. 



The spores when examined by transmitted light are orange-red, falling 

 off readily from their beds with generally only a small fragment of stalk 

 adhering. The spores measure about 36 /* in total length, and 18 to 22 

 in width at the septum. The epispore is very characteristically marked 

 by longitudinal, or more frequently oblique, sti-iation passing continuously 

 over both cells, giving the spore a twisted appearance somewhat like the 

 ovary of orchids. These striffi are interrupted ridges, as may readily be 

 seen in empty spores after germination (Figs. 6, 7, PI. XII). Placed in 

 water they germinate readily immediately after ripening. The upper 

 cells germinate first usually. The yellow contents of the spore wander 



