OLIVE COLORED ALGM. 99 



Stem, broken off or "frayed out" at the top. It 



is reported at Santa Cruz, California, only, where it 

 grows on rocks with Pterygophora. 



Gems.— AGARUM,'* Bory. 



AGARUM TURNERI, POST. AND RUPR. 



This plant differs from the Laminarim among 

 which it grows, by its shorter stem, its thinner blade, 

 its stout midrib running through the whole frond, 

 and, most of all, by the fact that it is perforated 

 throughout with holes of various sizes. This gives 

 it its popular name of " Sea Colandar." It grows 

 in deep water, holds to the rocks by a number of 

 root fibres, has a stem one-fourth of an inch in 

 diameter, three to twelve inches long which expands 

 somewhat as it enters the blade, forming a substan- 

 tial midrib. This blade is usually a foot wide, often 

 more, and from one to three yards long, though 

 you will often find it no more than a foot or half 

 a yard long. It has a rather more pronounced 

 green color than the LaminaricB, and, as before 

 remarked, is of thinner substance. It is very abundant 



* Agarum = A fungus or mushroom. 



