238 



ALG.-E 



from its own mother-cell, or an opening is formed at the apex of the 

 sporange through \Yhich all the zoospores escape after dissolution of the 

 septa. The zoospores are in all cases imbedded in mucilage ; no differ- 



FiG. ixi.—Giraiidia spliacelarioides D. and S. a, upper portion of thallus (x 250) ; b, lower portion 

 with multilocular sporanges(x 250). (After Areschoug.) c, portion of filament with unilocular 

 sporanges (x 6od). (After Hauck.) 



