208 CYSTOSPERMEiE. 



31. Vesiculipera alata Hass. 

 Plate LIII. Fig. 8. 



Char. Filaments scarcely exceeding those of V. Rothii in size. 

 Uninjiated cells about six times as long as broad. Spo- 

 rangia oval, having their long diameter placed in the axis 

 of the diameter of the inflated cells, such bearing cells very 

 protuberant laterally. 

 Hab. Penzance: Mr. Ralfs. 



This is one of the most remarkable siDCcics of the genus, 

 and the only specimens which I have seen of it are those 

 transmitted to rae by Mr. Ralfs. 



32. Vesiculifera Rothii Hass. 

 Plate LIII. Fig. 7. 



Char. Filaments rather more slender than those of the pre- 

 ceding species. Cells fully four times as long as broad. 

 Sporangia rather broader than long, contained in inflated 

 cells of the same form. 



V. bombycina Hassall, in Annals of Nat. Hist., vol. x. 

 p. 394. Conf. bombycina Ag. Harv. Manual, p. 126, 

 Prolifera Rothii M. Leon le Clerc, Mem. du Mus. 



Hab. Everywhere common. 



Three or four cells sometimes occur in juxtaposition. 



33. Vesiculifera Candollii Hass. 

 Plate LII. Fig 9. 



Char. Filaments of about the same diameter as those of V. 

 crisjja. Cells usually six times as long as broad. Sporangia 

 circular, contained in inflated cells zvhich are someiohat 

 narrower at one extremity than the other. 

 V. vernalis Hassall, in Annals of Nat. Hist., vol. xi. p. 434. 

 Prolifera Candolli M. Leon le Clerc, Mem. du Museum, 

 t. 25. fis:. 7. 



