266 p s t e I s i a 



specimen measures 1.3 meters. The width of 

 the widest specimen (6.5 centimeters) is slightly 

 greater than the average of shallow water forms 

 but not so great as the widest. Others are 

 extremely narrow, measuring for example, 3X 

 118 centimeters (Plate I., fig. 13) i. e. forty 

 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 

 gradual. The texture and histology of the 

 plant arc the same as the typical form. In the 

 variety the long narrow laminae and the irregu- 

 larity of the sorus together with the similar text- 

 ure, increase its resemblance to isolated laminae 

 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 

 100x4 centimeters, or it may be broken up into 

 several very narrow longitudinal stripes. In 



