154 Puget Sound Marine Sta. Pub. Vol. 1, No. 13 



PLATE 28 



Abbreviations. r=frond, /^holdfast, *^stipe. 



Fig. 15. Diagrammatic sketch of Laminaria saccharina showing the 

 region of greatest growth in a gradually broadening blade. 



Fig. 16. Diagrammatic sketch of Laminaria saccharina showing the 

 region of greatest growth in an abruptly broadening blade. 



Fig. 17. Egregia menziesii showing which parts are homologous 

 with those of Laminaria saccharina in figures 15 and 16. 



