200 CYSTOSPERMEiE. 



Vesiculifera pidchella var. Hassall, in Annals of Nat. Hist., 

 vol. X. p. 390. 



Hab. Cheshunt and its vicinity, especially Cheshunt Com- 

 mon : A. H, H. Penzance : Mr. Rolfs. 



Subsequent examination has confirmed the suspicion ori- 

 ginally entertained that this species, which was first sent me 

 by Mr. Ralfs, was distinct from V. pulchella : the inflated 

 cells are smaller and more hexagonal than they are in that 

 sj)ecies. 



11. Vesiculifera Yaucherii Hass. 



Plate L. Fig. 4. 



Char. Filaments about equal to those of V. pulchella. Cells 

 usually two and a half or three times as long as broad. 

 Sporangia circular, lodged in cells ichich are very consider- 

 ably inflated and of an ovate form. 



V. ventricosum Hassall MSS. Prolifera Vaucherii 9 M. 

 Leon le Clerc, loc. cit. 



Hab. Cheshunt : A. H. H. 



This is a very distinct species, differing from V. virescens 

 in its circular sporangia, and highly inflated cells, and from 

 V. pulchella in the ovate form of the inflations, which in 

 the latter species are slightly hexagonal. 



12. Vesiculifera virescens Hass. 



Plate L. Fig. 5. 



Char. Filaments equalling in diameter those of V. pulchella. 

 Cells once and a half or twice as long as broad, fasciated. 

 Sporangia ovate, contained in cells of the same form. 



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

 vol. X. p. 391. 



Hab. Notting Hill, near London : A. H. H. 



This species comes very near to the following, of which 

 possibly it may be but a variety. 



