202 



PHAEOPHYCEAE 



Fig. 135. Himanthalia lorea. A-D, stages in the liberation of the ovum ( x 22). 

 E, F, abnormal buttons. G, button from bottom of dense zone. H, button from 

 top of dense zone. I, mature megasporangium. J, plant with fertile fronds. (A-I, 

 after Gibb; J, after Oltmanns.) 



