1919.] The Sixth Indian Science Congress. e]lxix 
The rhizome and frond of Gonioptreis Prolifera (Rox).— 
G..8. avers 
i. eae inatza 
2. hizo pap nins e nal es internal anatomy, effect of seasonal 
variations, di Sereniert in the sizes of gaps, variations induced artificially , 
extraction we P hilobaphe 
tc —Im Satan 
t fea 
:—Exter oy cn es rs, its habit, description of sorus, 
earn) pica ool nature of the bud, multiplication. 
Notes on Vallisneria.—By L. A. Kenoyer. 
Study of Vallisneria spiralis, collected in northern India has resulted 
n the reco gnition of at least four forms s wide ly enough separated to be 
e e Ww 
nown as varieti d 
shallow-water form and a large deep-water form is most striking. The 
floral characters are in the main closely similar in these Indian forms. 
he comparison of the floral characters of the ry nines form, as 
figured by Kerner, the American form, as described and figured by Wylie, 
and the Indian forms, sororrd striking differences oe decteaee it highly pro- 
bable that share are a number of species of Vallisner 
A general consideration of some aspects of the fresh-water 
algal flora of Madras.—By M. QO. ParrHasaratuy 
AYYANGAR. 
Though the fresh-water algae of the Indian region has been 
ure out by or algalogists, the Madras fresh-water algae have not 
been worked out at all. 
2. The algal vegetation of Madras during the North-East ateenaag 
s very interesting. The conditions of lighting, temperatur 
e amount of gas dissolved in the r, ap ch som t to 
conditions preva egions; and so the algal flora, too, 
iling rat r 
assumes for the time being a temperate character. The blue-green algae 
which are generally predominant in the tropics are less dominant then. 
The green algae are more common as in a temperate regions. 
3. Green algae can be seen growing everywhere in sub-aerial regions 
are 
uring this se 
wn ae te Ss of the situations. he fo lowing c coul seen com- 
monly o ing on the walls of ae giving them a bright green 
colouration as ei the temperate regio 
1. A species of Pisssiphon.: 
2. A species of Ye woe 
3. A species of Pleuroc 
4, Trickling ——- masses 0 e-green algae which are gener- 
ally characteristic of the su oe regions of pe tropical uplands occur 
i ilar situati o ing the time. 
species of Nitella sania on een pee then. Members of 
the Volvocacese also occur on wet sand around pools of rain water 
isonet gtr Trentepholia and Oph 
been met oak by me rahegoeiar The place 
a species of Rh 1 evades wh ich commonly occurs throughout t the year 
in all moist shady sub-aerial situations. 
7. The Cladophorales are represented in Madras by Cladophora, 
Pithophora and Rhizocloniu 
8. The members of the Volvocaceae ee commonly in many 
pools during the monsoon season, for abana th lamydomonas Gonium, 
EBudorina, Pleuodorina and Volvoz. 
. Many ge tern forms which are generally rare in the tropics 
oecur commonly during this season, for example, Ulothrix, Hormospora, 
