NOTES ON FRESHWATER ALG 81 
cellulose, colouring a pale blue with chlor-zinc-iodine, and is folded 
and produced on its outer surface into all manner of irregular 
wrinkles, lobes, processes, and spines. Sometimes these irregular 
ne are wanting, but at other times the family can scarcely 
e seen for them. The membrane is undoubtedly a secretion of 
the ‘andaiiyiag 6 ells, and its presence renders the structure of the 
family exceedingly difficult of observation. 
e several of these small families occur agglutinated 
neh and a more indefinite-looking object it is impossible to 
magi Sometimes these small colonies are united by more or 
leas 2g gi prolongation of the enveloping membranes into much 
arger 
e a feusiliee multiply by division mM larger and Agios colonies, 
ultimately becoming separated into smaller groups by the deve- 
lopment of elongated processes of the su leone m petty ed 
Specimens have “been observed in which ‘the cells were slowly 
expelled from the families, each cell being sent into the surrounding 
water with a violent jer erk. Possibly such cells are non-motile 
spores (cfr. fig. 4); but this is doubtful, and no other approximation 
to a reproductive process has been observed. 
It is an exceedingly abundant ‘aii in all kinds of situations— 
in ditches, bogs, tanks, water-butts, &c.—and it forms recor 
considerable constituent of the British freshwater plankton. 
older families, especially in the plankton, the cell-contents 
develop a brick-red oily material, such as is found in Botryococcus 
Braunii Kitz. In fact, the latter alga is by far the po relative 
of I. neglecta, although not so abundant. Botryococcus Braunii is 
not found in many situations in which J. neglecta occurs abundantly ; 
its cells are larger and more globose, its colonies are more regular, 
and the families of cells are never enclosed in that tough membrane 
with its extraordinary irregularities which is such a striking feature 
of I. neglecta. 
‘90. PaLMELLOcocous MINIATUS (Kiitz.) Chodat in Bull. Her 
oissier, tom. ii. 1894, pp. 429, 599; Beitrage Kryptogamenfi. der 
Schweiz, Bd. 1, Heft 8, 1902, PP; 182, pee cum fig. 80. Pleuro- 
coccus miniatus Ni aig. Diam. cell. 2 
Hab. Bradford, W. Yorkallive, i peat tree-pots. 
This minute alga frequently forms a moist green scum on the 
outer surfaces of plant-pots and other similar objects. It has in the 
past been referred to under the name of ‘ Protococcus viridis Ag.” 
This name is obsolete, pitas 9 given indiscriminately to many 
algee of widely different chara 
The genu Messnseter is occus oF Chodat differs from Pleurococeus of 
Meneghini in "the absence of pyrenoids from the parietal, plate-like 
chromato hores, and in the methods of reproduction. There are 
ig 
cell into two or four daught ter-cells ; 2nd, by a a wibepenene: of 
the cell-contents and an euviation of the wall of the m -cell 5 
8rd, by the formation of 8, 16, 32, or 64 spores wi sithin thawed ; 
the ‘mother-cell, which then ruptures and sets them free. At the 
moment of their liberation these spores are in a Dus vesicle. 
JournaL or Borany.—Vot. 41. _— a 8 
