46 Puget Sound Marine Sta. Pub. Vol. 1, No. 8 



PLATE 7 



Fig. 1. Base of stipe, showing earliest rifts (R). X53. 



Fig. 2. Rift in upper portion of the stipe. X53. 



Fig. 3. Lower laminal region, showing elongating sieve-tubes and 

 enlarging rifts. X53. 



Fig. 4. Last massing of hyphae before true septum is formed. 

 Rift (R) enters from each side of hyphal mass. X53. 



Fig. 5. First true septum. A few small rifts occur in it. X53. 



Fig. 6. a^Lower portion of lamina. 6=Sporophyll tissue being 

 sent out from sides of rachis ; irregularities of surface foreshadow division 

 of tissues into sporophylls. c=Stipe. X0.8. 



Fig. 7. Paraphyses forming on young sporophyll. X53. 



Fig. 8. Young sporophylls sent out from rachis. X0.4. 



Fig. 9. Mature sporangia, showing pellicle (P) in which the tips 

 of the paraphyses rest. X272. 



