LITTORAL ALGAE OF PUGET SOUND 93 



or other protected places, from mid-tide to lowest visible depths; 

 sometimes on loose rocks or shells. 



■ 3. Prionitis lanceolata, in tufts on the margin of the pools. 



4. Prionitis Lyallii, coarser, less divided and lighter colored 

 than No. 3 and characteristic of mid-tide or deeper. 



5. Polysiphonia calijornica, growing in fine masses in the 

 deeper water; sometimes in shallow water or on loose rocks. 



6. Rhodomela larix, growing in large course masses in deeper 

 water, and most abundant at low tide. 



II. Shaw's Island, south end; pools larger, greater variety in 



size, elevation and light relation. 



No. I, almost wholly absent in this region; cause unknown. 



No. 2, good display at lower depths in protected crevices. 



No. 3, abundant at mid-tide, showing marked contrasts in 



size of plants and profusion of branching. 



No. 4, large size, mid fronds nearly a foot long; branching, 

 less profuse, lateral; color, yellowish. 

 No. 5, a small amount at low tide. 



III. Minnesota Reef, a rock about two miles south-east 

 of I. totally submerged at extreme high tide (spring-tide) and 

 hence was visited at the ebb of spring-tide. It is very rich in 

 amount and variety of material, but is not strictly tide-pool in 

 character at all times. 



No. I, very rare and of little importance here. 



No. 2, abundant; some on shells and loose rocks and it could 

 be seen at inaccessible depths. 



No. 3, present in considerable quantities, finely divided. 



No. 4, as described in II, good specimens. This varied enough 

 to suggest two or three species or varieties. 



No. 5, in great masses; optimum conditions. 



No. 6, as in I. almost below tide-pool conditions. 



No. 7, Ulva lactuca, in medium abundance at low tide. 



No. 8, Gigartina mammilosa, not abundant nor important. 



Corallina and Amphiroa were also found here in considerable 

 abundance, but scarcely in tide-pool conditions; hence they will 

 receive no further consideration. These have been treated in a 

 monograph by Yendo (10). 



IV. Unnamed rock, K mile south of III. This gave the 

 same indications as III. with greater variety in Prionitis, as it 

 extends above high-tide, affording small pools filled by spray 



