NO. 1 TAYLOR: PACIFIC MARINE ALGAE 7 



able distance from the other two members of the group, and a little to the 

 south. The island rises to a considerable elevation, and the shore is for 

 the most part exposed and rocky. The only good anchorage is at Sulphur 

 Bay. What vegetation could be seen from the shore w^as poor and xero- 

 phytic. There vv^ere considerable cactus-covered slopes up from the beach, 

 which was of fair extent, flanked by areas of highly lacunose lava. The 

 shore line near the landing place was not favorable for a rich growth of 

 algae. Neither here nor elsewhere on these trips where lava streams met 

 the sea did this lava rock provide a good substratum for varied algal 

 growth. 



In the lava reef pools there was a considerable growth of a few species 

 of green algae. In the highest tide pools only a few filamentous Myxo- 

 X)\^yctzt(Lyngbyaj Symplocajand a Cladophora were collected. Somewhat 

 lower there appeared a good deal of Dictyosphaeria australis and Litho- 

 phyllum bracchiatum. Practically everywhere in the upper and middle 

 intertidal area the lava rock was covered with Hildenbrandia. Most no- 

 table at a depth of a meter, and thence into deep water, was a great abun- 

 dance of Caulerpa racemose, which also was washed ashore in some 

 quantity. With it, but somewhat less abundant and not common in quite 

 so shallow water, were Halimeda Tuna and H. discoidea. On exposed 

 rocky points there was a little different flora, but it was not possible to 

 examine these well at the time of the visits. Caulerpa racemosa was again 

 a major element, with an abundance of Galaxaura filamentosa and Hali- 

 meda discoidea; Asparagopsis Sanfordiana was also secured here. 



There was a small amount of algal material washed ashore. The most 

 curious element was a little Macrocystis, which had been tossed high up 

 on the beach by a former storm, and which probably came from a con- 

 siderable distance. Recently rejected material of Caulerpa racemosa, 

 Dictyosphaeria australis, Calothrix pilosa, Lithothamnium indicum and 

 Jania capillacea made up the bulk of this driftweed. 



The Mason collections reported upon by Setchell and Gardner (1930, 

 p. Ill) show a considerable flora, reaching about 30 species, but there is 

 no indication that these plants grew within reach from the shore; they 

 were, rather, secured by dredging. The Hancock Expeditions also dredged 

 successfully here, but the stays were brief and the hauls few, so that by 

 no means a comprehensive view of the vegetation was secured. Neverthe- 

 less, with the shore collections a total of over 40 species was secured, with 

 several others not certainly identified. The Mason collections include 

 about 20 species which we did not find, there were about 10 in common 

 between the lists, and we got upward of 30 which the earlier collec- 



