A New Species of Uronema from India, 
BY 
S. L. GHOSE, M.Sc., 
Assistant Professor of Botany, Government College , Lahore, India . 
With Fifteen Figures in the Text 
F the genus Uronema , Lagerh., only three species have been recorded 
W up to now. £ 7 . con fervicolu m , Lagerh., and £ 7 . simplicissium, (Reinsch) 
Lagerh., were described in 1887/ while U. elongatum , Hodg., was described 
in July, 19 18. 2 In the beginning of March, 1919, I came across a species 
of Uronema which differed from all these three species. It was originally 
found growing on the walls of a narrow drain carrying dirty water from 
the kitchen in my house. The alga was taken in tubes in the original drain- 
water. In the laboratory it was washed in tap-water and examined. 
Numerous zoospores were seen to be given off, most probably on account of 
the change of environment. A few days afterwards fresh material was 
taken, and the same process was repeated. Again the result was the same. 
Some material was kept in a small jar filled with a mixture of tap- and the 
drain-water. This was placed near a window in the laboratory. In 
a week’s time the walls of the jar were seen to be covered with young 
filaments produced from germinating zoospores. 
The filaments are quite unbranched, and not enclosed in any mucous 
sheath. The mature ones sometimes reach a length above 7 mm. They 
are attached to the substratum by a rounded mucous disc found at the 
extreme tip of the basal cell. The basal cell shows a variety of forms. In 
mature filaments it is very long and attenuated, and is generally hyaline 
(Fig. j). It may be straight or curved (Figs. % and 3). In young filaments 
it is much shorter and usually has a chloroplast, which, however, dies off as 
the filament grows (Fig. 4). 
The apical cell also is, as a rule, gradually attenuated. Sometimes it 
is swollen at the base (Fig. 5). The tip is acuminate and usually slightly 
curved (Fig. 6). It may, however, sometimes be quite straight (Fig. 3) or 
very much curved (Figs. 7 and 8), The cell-wall in the apical part of the 
1 Lagerkeim in Malpighia, 1, fasc. xii, 1887. 
3 Hodgetts, W. J. : Uronema elongatum. New Phytologist, July, 1918, 
[Annals of Botany, Vol. XXXIV. No. CXXXIII. January, igao.J 
