XIV. ALOE. 



969 



Sargassum natans. Branch bearing floating bladders. 



*3*es 



Ulva bullosa. Portion of 



frond on which the cells divide to 



give birth to the zoosporea. 



Ulva bullosa. Portion of frond, 

 older, showing the empty cells. 



Lessonia fuscescens (l-30th natural size). 



Ulva bullosa. 

 Zoospores, bearing four hairs. 



Laminaria saccharina (l-30th natural size). 



