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SAUNDERS 



species of kelp that he at once took to represent a new genus. The 

 locality was visited for three successive mornings during the lowest tides 

 and although an abundance of material was washed ashore the plant 

 was not found in situ. Several other points in the bay were visited 

 but no sign of the plant was found. If it grows off the shore on 

 which it was collected, and the condition of the material collected 

 would indicate that it does, it must grow well down in the elittoral 

 zone, for twice a careful search was made along the whole shore line 

 at the lowest tide, where one could get out beyond the " kelp line." 

 The location in which the plant was collected and the frayed and torn 

 condition of the ends of the blade would indicate that it grows in ex- 

 posed localities. In all specimens collected the stipe was broken off 

 apparently just above the holdfast. The only holdfast seen was on an 

 almost perfect specimen (from which Plate LII was drawn) collected 

 by Miss J. E. Tilden in Puget Sound. 



Pleurophycus has no midrib in a proper sense, but has a broad shal- 

 low furrow indented on one surface and prominent on the other, the 

 surface of which is little thicker than that of the adjacent portion of 

 blade, except in the region of the sorus. 



This plant was first collected by Mr. N. L. Gardner in Puget Sound 

 in the summer of 1898 and sent to Dr. Setchell for identification. 

 Dr. Setchell recognized it at once as a new genus and gave it the above 

 manuscript name. The writer not knowing of Dr. SetchelPs name 

 gave his specimen a provisional name, but on learning from Mr. Gard- 

 ner of a previous name offered his specimens for comparison to Dr. 

 Setchell, who at once suggested the joint authorship of the name. 



Referring to the distribution of the plant Dr. Setchell writes " while 

 Pleurophycus may grow in the elittoral zone, all the evidence in 

 Gardner's and my possession shows that it extends even to the upper 

 sublittoral, as is the case with so many species credited to the elittoral, 

 Gardner found them just below low water mark, but in places much 

 exposed to the fury of the waves. Several of Gardner's specimens 

 have holdfasts which show several whorls of hapteres branched in a 

 somewhat irregularly dichotomous fashion and several times, the distal 

 branches being slender. 



Pleurophycus stands as the simplest of the subtribe Agarece, forming 

 something of a transition between that subtribe and the Laminariece. 

 Laminaria bullata Kjellman. 



In the sublittoral zone. Puget Sound ; Sitka (188) ; Prince William 

 Sound. 



All specimens collected were quite young and sterile but agree with 

 Kjellman's figures and descriptions. 



