170 



MORPHOr.OGY. 



sinks into tlic protoplasm of tlie egg roll, makes its way to the nucleus of 

 the egg, and fuses with it as shown in fig. iSi. The fertilized c-gg then 

 grows into a new plant. Nearly all the brown alga; are marine. 



Fic. 17S. 

 Antheridia nf Fucus, 

 branched threads. 



^^ t- 



Fij 



Fig. tSo. 



Anthcridia 1 if Fiiciis\\'ith Ecgsi'if Fuciissurrnnnd- 



cscaping spurnial'jZMids. ed by spcrniatuzoids. 



"_ V 



Fin. I,Si. 

 Fertihzatinn in Fncns, ]n. female nucleus, ijni, male nucleus; n , nucleolus. In 

 the left fiffure the male nucleus is shown mi>\'inK dnwn through the cytr)]ilasm nf the 

 egp; in the remaining fij^'ures the c\'toplasin df lh_ e^rc is omitted. (After Stras- 

 l.)urger. ) 



367. The Gulf weed (Sargassum bacciierum) in the warmer Atlantic 

 ocean unites in great masses \\\-\v h lloat on the \\ater, whenc f comes the 

 name "Sargassum Sea." The Sargassmn gn.ws on the coasl where it is 

 attached to the rocks, but the beating of ihc waves breaks many specimens 

 loose and these lloal oul into the more i]uict waters, where (hev continue 

 to grow and mtiltiply \'egctati\(.-l\'. 



368. Uses. — Laniinaria jajionica and I., anguslata are used as food bv 

 the Chinese and lajianesc. Some s|ki ies ol the Laniinariacea' ,ire used as 

 food for cattle ,'ind are also used fir Icrlili/iTs, while \, digilata is some- 

 times employed in surgery. 



