LAMINARIALES (HETEROGENERATAE) 187 



a small partial blade persists at the outer extremity of each false 

 stipe. New sporangia continually arise at the base of the old ones, 

 and the genus is interesting because the cuticle is shed when the 

 sorus is mature (cf. p. 277). This is one of the few Laminariaceae 



Fig. 126. Egregia Menzesii. A-C, stages in growth of young sporoph>tes ( x y%). 

 D, young frond. E, base of mature frond. F, apex of mature frond. G, mature 

 plant. (A-C, after Griggs; D-G, after Oltmanns.) 



in which the number of chromosomes has been counted, the haploid 

 number being fifteen. Two species are known, one from southern 

 California and one from Japan. 



Alariaceae: Pterygophora (pterygo, wing; phora, bearing). 



The perennial sporophyte, which arises from a holdfast of 

 branched haptera, possesses a simple, solid stipe that is more or 



