RENEREWIA “GENZ NOV: 
FHloldjast simple, discoid, without haptera 
arising on the stipe; sort extremely irregular; 
tissues little differentiated; lamina plane, entire, 
without prolijerations, unbranched. This genus 
is separated from Laminaria because of its 
simple discoid holdfast without haptera which 
together with its small size and evident sim- 
plicity of structure marks it as one of the most 
primitive of kelps. The absence of branching 
haptera arising around the primitive discoid 
holdfast and taking its place does not seem 
at first thought a very striking character. But 
it signifies a difference in the structumeyomsrme 
plant fully as profound as the absence of a 
stipe which was considered sufficient ground 
for the separation of Hedophyllum; or a fold- 
ing and irregular growth in the lamina which 
differentiates Pleurophycus from Laminaria. 
There are two species previously described as 
Laminarias which have simple holdfasts, Lami- 
naria solidulgula Agardh and Laminaria yezzen- 
sts Miyabé. The relations of these” fo grhe 
present species as well as its relation to other 
