390 Mr. HassalPs Notices of British Freshwater Conferva. 



Vesiculifera prolongata. Filaments more slender than those 

 of the preceding species ; cells usually seven times as long 

 as broad ; spores oval, contained in inflated cells of an ovate 

 form. 



This species is known from Vesiculifera Landsboroughi by 

 its finer filaments, longer cells, and ovate form of the spore- 

 bearing inflated cells. I have twice met with it, once in a pond 

 near Louton, and again near Enfield. 



Vesiculifera lacustris. Filaments nearly equal in diameter to 

 those of Vesiculifera prolongata ; cells from three to five 

 times as long as broad ; spores oval, sometimes almost qua- 

 drangular, solitary, occasioning no very considerable en- 

 largement of the cell in which it lies ; empty cell next the 

 spore also inflated. 



Vesiculifera lacustris differs principally from V. crassa in 

 the less diameter of its filaments, and in the presence of the 

 inflated empty cell placed next to the spore. 



In the New River Reservoir near Cheshunt, sparingly, and 

 other places in the vicinity. 



Vesiculifera paludina. Filaments of less considerable dia- 

 meter than those of Vesiculifera capillar is ; cells two and 

 a half or three times as long as broad ; spores at first cir- 

 cular, but subsequently becoming ovate, contained in di- 

 stinctly inflated cells of an ovate form. 

 This species bears some resemblance to Vesiculifera capil- 



laris, from which it is to be distinguished principally by its 



smaller size, and the form of the perfect spores. 



It is very abundant, and is now (August) to be met with 



plentifully in fructification, in ponds in brick-fields near Not- 



ting Hill. 



Vesiculifera pulchella. Filaments nearly equal in diameter to 

 those of the preceding species ; cells usually two and a half 

 or three times as long as broad, but sometimes twice, and 

 rarely four times as long as broad ; spores circular, con- 

 tained in much inflated cells, which are at first oval, then 

 circular, and lastly somewhat hexagonal. 

 This is a very fine species, seeking usually rather pure 

 water ; it is of an intense and beautiful green colour. I have 

 met with it several times both in the neighbourhoods of Ches- 

 hunt and Notting Hill. 



Var. a. Filaments more slender than those of the preceding 

 species ; cells four times as long as broad ; spores circular, 

 contained in cells which are nearly of a spherical form. 



