266 Postelsia 
specimen measures 1.3 meters. The width of 
the widest specimen (6.5 centimeters) is shghtly 
greater than the average of shallow water forms 
but not so great as the widest. Others are 
extremely narrow, measuring for example, 3x 
rro.centimeters (Plate 1; ties 13) “1 emmtemar 
times as long as wide though lacking both 
holdfast and tip. The stipe is similar to the 
shallow water forms but averages longer and 
the merging of stipe and lamina is much more 
eradual. The texture and histology of the 
plant are the same as the typical form. In the 
variety the long narrow lamine and the irregu- 
larity of the sorus together with the similar text- 
ure, increase its resemblance to isolated lamine 
of Nereocystis for which they have doubtless 
been mistaken many times as they are quite 
abundant at ‘‘Dictyoneuron Cove.” growing 
just outside in the deep water. 
The sorus is similar to that of the specific 
form. Sometimes it is a large patch covering 
the larger portion of the lamina, measuring 
roox4 centimeters, or it may be broken up into 
several very narrow longitudinal stripes. In 
