196 CYSTOSPERMEiE. 



Vesiculifera capillaris LinnECUS? Hassall, in Annals of 

 Nat. Hist., vol. x. p. 389. V. princeps Hassall, in 

 loc. cit. Prolifera composita Vaucher, Hist, des Conf., 

 p. 133. pi. 14. fig. 5. 



Hah. Ponds near Netting Hill; Cheshunt, and its 

 vicinity : A. H. IL 



A'NTietlier the Vesiculifera, wliicli is here regarded as the 

 Conferva capillaris of Linnasus, be that species or not, there 

 can be no question but that it is the same plant as that con- 

 sidered as such by Agardh, as I have been able to ascertain 

 by the examination of an authentic specimen of Agardh's 

 C. capillaris var. B. alternata, contained in the Herbarium 

 of Dr. Greville. None of those who have noticed tliis 

 species were at all acquainted, however, with the true re- 

 production. 



3. Vesiculifera condensata Hass. 



Char. Filaments of more considerable diameter than those 

 of V. capillaris. Cells not so long as broad. 

 Vesiculifera condensata Hassall, in Annals of Nat. Hist., 

 vol. X. p. 388. 



Not having again met with this species since it was de- 

 scribed in the Annals, and never having seen it in a state of 

 reproduction, I am led to think that possibly it may be but 

 a variety of C. capillaris ; than which, however, the filaments 

 are thicker, and the cells much shorter. It was found ad- 

 herent to a wall reached by the tide in the Thames near 

 Barnes. 



4. Vesiculifera crassa Hass. 



Plate LI. Fig. 1. 



Char. Filaments y?<% equal in diameter to those of V. capil- 

 laris. Cells usually Jive times as long as broad. Spo- 

 rangia oval, generally solitary, but soinetimes binary, con- 

 tained in cells of a slightly oval form, the length of lohich 

 about txoice exceeds the diameter. 



