ee Re ee ae eee 
4. Some observations and experiments on the rust on 
Launea aspleniifolia DC. 
By Karm Cuanp Menta, M.Sc., Professor of Botany, Agra 
College, Agra. 
{With Plates I-I1.| 
t also gives an. account 
attempts to add a short supplementary description of diseased 
plants at various stages in the life history of the fungus. The 
work was first taken up at Pusa in March 1916 at the sugges- 
tion of Dr. E. J. Butler, the Imperial Mycologist, and I desire to 
express my warmest thanks to him for having provided me 
with every possible facility connected with it. Launea 
: The work referred to above contains a description of 
diseased plants as well. 
__ The cause of rust on Lawnea is the parasite which was 
identified later on as Punccinia Butleri syd., nov. spec., and is 
described in ‘* Fungi Indice Orientalis ” Part I. . 
n the strength of observations extending over a period of 
full one year, the author has got to add the following few 
remarks about the habit of the diseased plants with a short 
supplementary description of the same :— 
The diseased shoots in the uredo and teleuto stages like the 
healthy plants have got as a ‘rule short unbranched stems 
ring rosettes of radical leaves with thin lamina covered with 
Sori (Figs. 2,4 and 5). Uredosori°3—"6 x °25—"5 m.m. often 
arranged in circles around a central pustule. Uredospores with 
Sori are quite distinct from the Uredosori, found in very large 
numbers towards the end of the cold season although not 
