Freshwater Algse and Schizophyceie. By A. W. Bennett. 7 
HYDRODICTYEiE. 
Hydroclictyon reticulatum * (L.) Lagerh. 
In great abundance in a pond near Haslemere. 
PEDIASTRE2E. 
Staurogeneis rectangularis A. Br. 
Not uncommon in the larger ponds. 
Pediastrum Boryanum Men. 
„ Ebrenbergii A. Br. 
„ gracile A. Br. (Figs. 3, 4.) 
Ccenobe small, composed of a small number of cells, not more 
than nine, very light green. Marginal cells deeply divided, with two 
long acuminate hyaline horns, which are generally curved. There 
has been great confusion between this species and P. simplex Mey. 
The species above described was seen several times among water-weeds 
in the larger ponds. I cannot doubt that it is Braun’s species — which 
has at present been observed nowhere except in Great Britain — 
although the form of the marginal cells does not altogether corre- 
spond to the drawings in Cooke’s Freshw. Algae or in Ralfs’s 
Desmidieae (sub nom. P. simplex). 
Pediastrum glanduliferum sp. n, (Figs. 5-7.) 
Cocnobe elliptical, 300-400 p, very dark green, solid or with only 
very small intercellular spaces ; marginal cells usually pentagonal or 
hexagonal, with a small semicircular incision in the external wall, 
two-horned ; each horn springing from about mid-way between the 
side-wall and the incision in the external wall, quite hyaline and 
sharply cut off from the endochrome of the cell, very slender, capitate ; 
marginal cells about 12*5 x 10 p ; horns about 15 p long. The 
marginal cells somewhat resemble those of P. Ehrehbergii, but are not 
so deeply indented. The shape of the incision and the round knobs 
at the extremity of the horns sharply distinguish this pretty species 
from any other in the genus. Among water-weeds in the smaller 
of the two large ponds at Frensham. 
VOLVOCINEiE. 
Yolvox globator L. 
Eudorina elegans Ehrb. 
* This was first described by Linnaeus as Conferva reticulata (Sp. plant., 1635)- 
When Roth established the genus Hydrodictyon, he altered the specific name to utri 
culaturn ; but the much more expressive Linnaoan name must clearly bo restored. 
