IP 5 t e I s i a 251 



genera can best be considered after the descrip- 

 tion of this, the type species of the new genus, 

 has been presented. 



Renfrewia parvula n. sp. 

 Plant very variable in shape, size and pro- 

 portions, but in texture and anatomy very 

 constant; laminae thin (less than i mm.) and 

 more delicate in texture than any other kelp 

 of the region except Nereocystis (which they 

 resemble somewhat closely), yellowish-brown; 

 cryptostomata absent even on young plants; 

 stipe terete below, more rigid than the lamina 

 but very much weaker than in Laiuinaria 

 saccharina which is most nearly similar to it 

 of the species found at Port Renfrew. Lamina 

 oblong, in mature specimens varying from 

 25-90 millimeters in width, as much as 50 

 centimeters long, but varying greatly according to 

 the violence of wave action, at the base usually 

 cuneate and very gradually merging into the 

 stipe but in broad short-stiped specimens some- 

 times rounded; stipe varying from 2.5-20 cen- 

 timeters in length without apparent relation 

 to the age of the plant or any other condition 



