122 Notes on Algcs. [zoe 



the case of those plants growing near high-water mark. Stipe 

 of the young plant" very short and much flattened, soon disap- 

 pearing. Blade at first ovate and entire, soon splitting deeply, 

 even to the very base, and becoming decidedly cucullate, with 

 frequent, large mucilage ducts. Sorus unknown. 



More or less common on smooth rocks, in the littoral zone, 

 on exposed shores from Fort Ross, Sonoma County, California, 

 to Puget Sound. Fort Ross, W. A. Setchell!; Trinidad, Cali- 

 fornia, C. M. Drake!; Esquimalt, British Columbia, Dr. Lyall 

 {fide Harvey), W. A. Setchell!; Victoria, British Columbia, 

 Miss J. E. Tilden!; Whidby Island, Washington, N. L. Gardner! 

 This species is the Laminaria sessilis Ag. and the L. apoda 

 Harv. It has been distributed under No. 344, Tilden, American 

 Algae (under the name of Laminaria sessilis) and under No. 

 VIII, Phycotheca Boreali- Americana (under the name of Hedo- 

 phylhtm sessile). 



Hedophyllum subsessile (Aresch.) Setchell mss. Frond 

 ample, 60 to 75 cm. long and, in the adult condition much broad- 

 er than long. Young plant provided with a normal holdfast, 

 with branching hapteres and a short, stout, somewhat flattened 

 stipe. Blade of the young plant at first narrow and simple, then 

 broader and divided, with at length cordate base and marginal 

 rows of bullate swellings. In the older plant, the base of the 

 blade becomes more and more cordate, even to reniform, the basal 

 margins begin to thicken and give rise to hapteres which attach 

 the thickened bases to the substratum, the central portion of the 

 blade dies away clear to the base and there is left two separated, 

 partial blades, each borne at the extremity of a thickened basal 

 margin which resembles very closely a running rootstock, and 

 has been so described by Areschoug. Segments of the blade 

 broader or narrower, somewhat cucullate at the base, but without 

 auricles, and with large and frequent mucilage ducts. Sorus 

 unknown. 



The writer's specimens came from the Island of Amaknak in 

 Unalaska Bay, and the species is probably common throughout 

 the Aleutian Islands. Areschoug does not say whence his speci- 

 mens of this plant was obtained, except that the inference is that 



