SAUNDERS 



[430] 



The young plants have a short distinct flat stipe 1-2 cm. long and 

 5 or more mm. broad, the stipe soon disappears or becomes attached to 

 the substratum by its whole length, the old blades are a foot or two 

 in length, irregularly longitudinally torn above, bullate and folded in 

 the lower part. 



Hedophyllum subsessile (Aresch.) Setchell (Mss.). 



Laminaria bongardiana subsessilis ARESCH., Obs. Phyc. 4 : 5. 



Abundant in exposed places, from Puget Sound northward. Yaku- 

 tat Bay (218); Prince William Sound (259); Kukak Bay (337^). 



This plant, heretofore considered a form of L. bongardiana, is made 

 the type of a new genus by Dr. Setchell, on account of the prostrate 

 rhizome. The creeping rhizome-like affair is apparent only in old, well 

 developed plants. The stalk is always short, 14 or 5 cm., and in ma- 

 ture plants much flattened above, in old specimens being as much as 

 2 cm. or more wide. The blade is dark brown, thick and leathery, 

 reaching a length of 3 or more meters. It is usually split nearly to the 

 base into 3 somewhat equal parts each one of which is more or less 

 irregularly cut and torn. 



Cymathere triplicate (Post & Rupr.) J. Ag. 



Abundant from Puget Sound to Shumagin Islands. This species is 

 gregarious and usually found pretty well down in the sublittoral zone 

 or in the upper part of the elittoral zone. While not of extreme size 

 this plant forms a large part of the kelp flora in many places. 



Agarum gmelini Mert. (Plate LXI.) 



In the sublittoral and elittoral zones in exposed localities. This spe- 

 cies and Desmarestia aculeata form the majority of the elittoral flora 

 in many places. Prince William Sound ; Yakutat Bay ; Kukak Bay ; 

 Popof Island. 



In mature specimens the outline is rotund or reniform and the mid- 

 rib broad and flat. 



Three specimens from different localities gave the following meas- 

 urements. 



