340 KJELLMAN, THE ALG^ OF THE AKCTIC SEA. 



PLATE 22. 

 Alaria oblonga. 



Fig. 1. Very young specimen. *',. 



» 2. Older specimen, not yet bearing sporopliyll. Vi- 



» U. Old specimen with sporophylls bearing zoosporangia. V,. 



» 4. Sporophyll with sorus developed, '/j. 



PLATE 23. 

 Alaria elliptica. 



Fig. 1 — 2. Specimens at different ages. 



PLATE 24. 

 Phyllaria lorea. 



Fig. 1. Young specimen. '/,. 

 » 2. Somewhat older specimen. Vi- 

 » 3. Full-grown specimen with sorus in development, '/g. 



PLATE 25. 

 Phyllaria dermatodea. Fig. 1 — i. 



Fig. 1. Transverse section of the stipe of a young specimen with a ring of thick-walled, tubular cells on the 

 limit between the middle and intermediate layers. */j. 

 " 2. Part of the same transverse section: im the thick-walled, tubular cells, '""/i- 

 « 3,4. Parts of two such cells. *"']. 



Phyllaria lorea. Fig. 5—6. 



Fig. 5. Inner part of a transverse section of the stipe of an older specimen, with long, tubular, but thin- 

 walled cells (m). 200/^. 

 » 6. Transverse section of the lamina with a cryptostoma. '"Vi- 



Laminaria saccharina f. grandifolia. Fig. 7. 



Fig. 7. Part of a transverse section of the lamina with lacuna mucifera (1) '""/j. 



Laminaria nigripes. Fig. 8—10. 



Fig. 8. Outer part of a transverse section through the stipe with lacunee muciferie. *"/,. 

 The specimen is from Spitzbergeu, determined as L. nigripes by J. G. Agardh. 



