196 CYSTOSPERME^. 



Vesiculifera capillaris Linnasus? 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. 



Hob. Ponds near Netting Hill ; Cheshunt, and its 

 vicinity : A. H. H. 



Whether the Vesiculifera, which is here regarded as the 

 Conferva capillaris of Linnaeus, 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 this 

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

 production. 



3. VESICULIFEBA 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 fully equal in diameter to those of V. capil- 

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

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

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

 about twice exceeds the diameter. 



