% 
i 
ie 
' 
; 
FRESHWATER ALGAE FROM INDIA. 295 
The specimens were very similar to Turner’s figures, differing chiefly in 
the somewhat broader isthmus, and in the processes of the lower whorl, which 
instead of being shorter, were about equal in size to those of the upper whorl. 
In some specimens, both whorls of processes were very much shortened and 
sometimes dilated. The end view was invariably 5-angled. 
Genus Oocardium Nag. 
195. 0. stratum Nag. Gatt. einz. Alg. 1849 ; Senn in Botan Zeitung 1899, 
p. 81. 
Var. minor var. nov. - PL AL, figs. 21-24. 
Var. forma typica multo minor. 
Zygosporis polyhedricis vel recta 
lis magnis irregularibus instructa. 
Long, cell. 7-8 »; lat. 12-14 p; crass. 75-95 pw; diam. 2yg- 15-20 p. 
Hab. Small stream under Pongging in the Abor Hills (36169). 
The Alga. was forming a stony stratum about 1 mm. in thickness over 
certain leaves, which had apparently fallen into the stream, and had become 
covered with a thin film consisting of filamentous Bacteria, fungal hyphae 
and other debris. The leaf and debris were quite encased in the emgage ed 
mass, In the upper part of the stratum the characteristic radiating stony 
tubes of the Oocardium could be recognised, with the tiny cells at their upper 
aperture. 
The cells were little more than half their usual size, and 2y sagas f the 
very plentiful, all stages in the fusion of the gametes and the formation of ; oe 
eae ae being present. The young zygospores were airy : 
ater became deep olive-brown. : 
It is peculiar +h although this extraordinary Desmid has sr RES 
for so many years its zygospores have only just been found. __ Ys zie 
gratifying that they have at last been discovered’, since it is now Prov ad 
all doubt that the Alga is placed inits proper systematic ee 
Oocardium stratum has previously only been —, -_ ane 
ties in Central Europe, and its discovery ‘n India is particularly m 
ngularibus, membrana laevi, sed mamil- 
o 
Genus Onychonema Wallich. 
p- 206, t. 3, £. 34. 
196. 0.1 . Brasil. 1869, 
aeve Nordst. Desm nar et Char. 1880, p- 3- 
Var. microcanthum Nordst. De Alg. 
Long. 13 p; lat. cum sp. 93-25 w. ; 
Hab. In ditch at edge ofrice field near Sadiya (32683). 
