HOW TO KNOW THE SEAWEEDS 

 128b Blade not perforated. Fig. 167 Pleurophycus gardneTi 



-( 



/ 



Fig. 167. Pleurophycus gardneri Setchell & 

 Saunders 



An entire plant to show the unbranched 

 habit, the broad, flat "midrib," and ruffled 

 margins of the blade, X 0.1. 



Although this species is reported in the 

 literature from Yakutat Bay, Alaska to as far 

 south as the mouth of Coos Bay, Oregon, it 

 may well extend on down the coast to Cali- 

 fornia. Its wide separation from Laminaria 

 in this key, because of its prominent, broad 

 "midrib," or fold, is quite artificial, for it seem- 

 ingly is closely related to that genus. This 

 solitary member of the genus Pleurophycus 

 was discovered at the end of the last century 

 almost simultaneously by two different work- 

 ers, one at Whidbey Island, Washington, the 

 other at Yakutat Bay, Alaska. In Washing- 

 ton it was growing just below low water 

 mark in places much exposed to the fury of 

 the waves, while in Alaska it appeared 

 abundantly in drift. 



PJeurophycus apparently comes into repro- 

 ductive condition only once and then dies. 

 The zoosporangial sori are borne in narrow 

 areas on both surfaces of the broad "midrib." 



Figure 1 67 



127 



