Laguna Marine Laboratorp 203 
equal in size the great bladder-kelp of northern waters, Nereocystis 
lutkeana. 
Macrocystis pyrifera (Turner) Agardh 
(Figure 111) 
Enormously abundant in about six fathoms of water. This is the 
common kelp forming the great off-shore beds along the Southern 
California coast. It becomes above fifty feet in length at Laguna 
Beach. Immense quantities of it wash up on the beach. Investiga- 
tions are being carried on elsewhere to determine its value as a 
fertilizer. 
SS 
ie 
SS 
a 
SSS 
a 
=e 
— fe 
Z 
SSS 
BEES 
== 
LO ME. 
Dp Lz 
Figure 117. Polysiphonia verticillata Harv. 
Egregia laevigata Setchell 
(Figure 112) 
Abundant near the low tide mark. Length very variable but often 
reaching over twelve feet. Commonly found in company with 
Hisena arborea, and very variable in the form of the fronds. 
FUCACEAE 
Hesperophycus harveyanus (Decaisne) Gardner 
(Fucus Harveyanus Deecaisne) 
Common on the rocks of the high tidal zone, growing most com- 
monly along the lower limits of the zone of Pelvetia fastigiata. 
