VE8ICULIFEKA. 197 



Vesiculifera crassa Hassall, in Annals of Nat. Hist., vol. x. 

 p. 389. 



Hab. In a pond at Wood Green, near Bury Green, vicinity 

 of Cheshunt : A. H. H. 



The only species near to which this approaches is F. 

 Landshoroughi ; than which the filaments are much thicker 

 and the inflated cells shorter and less marked. 



Having met with it now several times, I have not a doubt 

 of its being distinct from V. Landshoroughi. 



5. Vesiculifera Landsboroughi Hass. 



Plate LI. Fig. 2. 



Char. Filaments o/* considerable diameter, but scarcely so 

 large as those of the preceding species. Cells at the period 

 of fructification, about five or six times as long as broad. 

 Sporangia oval, contained in inflated cells of an elongated 

 but not regularly oval form, these occurring usually singly 

 at intervals of three or four cells, but sometimes two are 

 juxta-posed. 



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

 vol. X. p. 389. Prolifera rivularis M. Leon le Clerc, 

 Mem. du Mus. t. 25. 



Hab. Vicinity of Cheshunt, very rare : A. H. H. In an 

 old coal-pit near Stevenston, Ayrshire : Rev. D. Lands- 

 borough. Penzance : Mr. Ralfs. 



I have much pleasure in dedicating this, one of the finest 

 species of the genus, to the Rev. David Landsborough, by 

 whom the merit of its discovery is shared equally with myself, 

 as an expression of my warm admiration of the zeal displayed 

 by that gentleman in the cause of natural science. 



I have met with this species but sparingly myself, but have 

 received excellent specimens of it in a state of reproduction 

 from Mr. Landsborough, who aptly compares the form of 

 the seed-bearing cells to that of the " soldering of lead 

 pipes," 



o 3 



