Postelsta 251 
genera can best be considered after the descrip- 
ticn 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: lamime thine (less than © mim.) 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 Laminaria 
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 
