238 



ALGM 



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

 sporange through which all the zoospores escape after dissolution of the 

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



FlG. 212. — Giraudia spkacelarioides D. and S. a, upper portion of thallus (x 250) ; h, lower portion 

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

 sporanges ( x 6o3). (After Hauck.) 



