1917 



Muenscher; Key to Phaeophyceae 



265 



blade ; blade vertically split into several long segments ; mucilage ducts 

 present in both stipe and blade. 



Infrequent on rocks in the upper sublittoral zone. 



i. Laminaria bullata Kjellman, Om Beringhafvets Algflora. p. 46. 1889. 



Fig. 18 



Holdfast or branched hapteres ; stipe terete at extreme base, much 

 compressed above, one to ten cm. long; blade very variable in size and 

 shape, long, narrow or broad, entire or split lengthwise, with two longi- 

 tudinal rows of crossfolds or bullae in the margins, dark brown and rather 

 thick; mucilage ducts present in both stipe and blade. 



A very variable species represented more commonly by several forms 

 common on rocks in the lower littoral and upper sublittoral zones. Some 

 specimens show distinct characteristics of /. amplissima, f. angusta and 

 /. suhsimplex of Setchell & Gardner (l-i). The occurrence of so many 

 intermediate forms suggests the possibility that many of the forms under 

 this species may be variations due to differences in age and habitat. 



Hedophyllum sessile 



PLATE 55 

 Fig. 20. Sketch of plant. (After Saunders.) X 0.2. 



