FRESHWATER ALGAE FROM INDIA. 281 
LE TT 
Genus Debarya Wittr. 
93, D. desmidioides W. & G. S. West, Notes Alg. 3, 1903, p. 7, t. 446, £. 1-9. 
Var. orientale var nov. Pl. 11, figs. 17-20. , 
Var. filis longis nec facile dilabentibus, articulis parum constrictis, con- 
jugationis tempore tantum in cellulas dissociatis. : 
Crass. cell. veg. 6-7 u; long. cell. 30-67 wu; diam. Zys- 20-25 y. 
Hab. In shady pool above Matiana at 8500 ft. (28684). ; 
The Alga was present in great quantity and was. freely conjugating. The 
sterile filaments were often of great length, and the cells themselves long and 
slender, and only slightly convex at the apex. The structure of the cell was 
variable to some extent, but there were always two small pyrenoids in the 
middle of the cell, surrounded by the slightest film of chromatophore. The 
nucleus was sometimes inserted between the two pyrenoids as in Zygnem®, 
but occasionally it was lateral in position. The appearance Was usually more 
"suggestive of Zygnema than of ougiotia, but this may have been due in part 
to prolonged preservation in a poor fixing reagent. : 
During and after dissociation prior to conjugation the isolated cells ae 
more like Debarya desmidioides as figured by W. & G. 8. West, the ends . 
the cells becoming much more convex. The conjugating oblly Were ene 
similar to the Cornish ones, the old gametangia undergomg the same pre 
becoming glistening and apparently solid. Comparatively ven - cil 
conjugation were most frequent, but one mature zygote with a golden-r0 
wall was observed. ie 
It is extremely interesting that a form ofa species originally , pn 
Cornwall, should next be recorded at an altitude of 8500 ft. in the ea 
4 
Genus Zygnema Ag. 
94. Z. pectinatum (Vauch.) Ag. 
Var. deeussatum (Vauch.) Kirchn. Forma cf. 
New Cal. 1922, p. 65. ee 30-40 By 
Crass. fil. veg. 16-18 u ; diametro 2-4-plo ig ee 1y8 
Hab. i : from New 
This Alga agréed almost exactly with that desoribed and ie — res 
Caledonia. The cells were, however, slightly shorter -sorm conjugation 
conjugation was regularly lateral in the samt ee described Alga. The 
occurring occasionally as a great rarity as in the gr and showed @ conspi- 
zygospores were rather better developed than ) 
cuously scrobiculate membrane. Z sgt 
95. Zygnema sp pl. 11,86-*"  . ‘ akinetae fusca 
; teriore 
Z. akinetis cylindricis instructum, membrans 
punctata, exteriore hyalina. : ? 
Carter, Freshw. Alg. 
