152 MINNESOTA BOTANICAL STUDIES. 



i. Phyllospadix scouleri. 



Occurs abundantly around the upper edge of the circular 

 pool on the southwest and west, and a few much worn plants 

 on the north. In the shallow arm it occurs on the south side 

 and across the bottom. 



2. Cheilosporum frondescens. 



Occurs around the upper edge of the pool on the north and 

 northeast. Extending down one foot. It occurs abundantly 

 on the bottom of the shallow arm. 



3. Cheilosporum planiusculum. 



Occupies a zone below No. 1, following down crack two 

 feet below the furface. 



Abundant on bottom of shallow arm. 



4. Cheilosporum calif ornicum. 



Occurs below No. 2 in protected crevices and beneath the 

 Phyllospadix . 



5. Polysiphonia sp. 



Occurs in scattered tufts over the bottom of the shallow arm. 



6. Corallina aculeata. 



A small amount occurs beneath No. 1 on the south side of 

 the shallow arm. 



7. Amphiroa cretacea. 



A few plants were found on a mussel on south side of the 

 shallow arm. 



Pool No. VII. 



Location. — Mid-tide pool. At a level one half foot below 

 No. 6. Distance from edge of ridge four feet. 



Exposure to Tide. — The waves enter from southwest and 

 drain to the southwest and east. The pool is subject to a vortex 

 action as described in No. 5. 



Shape and Dimensions. — Circular. Sides covered with 

 mussels. South side somewhat overhanging. The other sides 

 almost perpendicular. 



Bottom covered with small pebbles. Diameter three feet. 

 Depth two feet. 



Flora: Kind and Distribution. 



1 . Corallina vancouveriensis. 



Occurs around the edge of the pool except on the south. 

 Extending down eight inches. 



