8 
composition of this gas varying according to the time of day, as 
season’s growth, as, in most cases at least, Nereocystis appears 
xe) an annual plant. This rapidly growing bladder kelp is, 
so far as abundance an siveness are concerned, st 
in the United States and since that time has greatly advanced in 
: e. 
nother large kelp of the Faate coset that is rich in poten is 
Mk ke 
Ppa the “‘e elp,’ the “sea pumpkin,” or “sea 
ora: ich is a close ee of the Nereocystis, but is more 
Seay e, occurring from Point Concepcion, ne: 
San Diego and other sout! Californian tow 
But kelp of our western coast that from its general abun- 
dance and massiveness seems likely to be of the most importance 
as a source of Macrocystts—known also as the “great 
0 
kelp’’-—a name that it seems to deserve even when compared 
* Bot. Gaz. 45: 126, 1908. 
