KONGL. SV. VET. AKADEMIENS HANDL. BAND. 20. N:0 5. 341 



Fiij. 9. Part of tlie same traiisverse section with three lacuiiiB mucifene (1.). ""•/,. 

 n 10. Part of a transverse section of the lamina with a lacuna raucifera. *"%. 



Alaria dolichorhachis. Yig. 11—18. 



Fig. 11. Part of a transverse section of the stipe. ^5/,. 



» 12. Transverse section of the stipe near the base in an older specimen. Vi- 



» 13. Transverse section of the older part of the rhachis, not bearing sporophylls, of the same specimen. '/,. 



» 14. Transverse section of the part of the rhachis bearing- sporophylls, of tlie same specimen. '/i- 



" 15 Transverse section of the rhachis where it passes into the costa. '/i- 



» 16. Transverse section of the oosta at the middle of the lamina. ^/j. 



» 17. Zoosporangium. '""/i. 



.. 18. Paraphysis. '■""/i- 



Alaria esculenta f. typica. Fig. 19. 



Fiij. 19. Transverse section of the costa at the middle of the lamina. Specimen from the west coast of 

 Norway. -/i- 



Alaria membranacea. Fiy. 20. 



Fiy. 20. Transverse section of the costa at the middle of the lamina, in a specimen from the coast of Nor- 

 wegian Finmarken. Vi- 



Alaria oblonga. Fig. 21— M. 



Fig. 21. Transverse section of the stipe and 



» 22. Transverse section of the part of the rhachis bearing sporophylls, of the same specimen. ^/j. 



» 23. Transverse section of the costa of a young and 



» 24. of an older specimen. '/',. 



Alaria elliptica. Fiy. 25 — 26. 



Fig. 25. T'ransverse section of the costa of a young and 



26. of an older specimen. 



1 



, ]• 



PLATE 26. 

 Scytosiphon attenuatus. Fig. 1 — 5. 



Fig. 1. Several speciraens issuing from the same fastening-surfaoe. Vi- 



" 2. Uetaohed specimen. '/j. 



" 3. Transverse section of the wall of the frond with gametangia (zoosporangia rnultilocularia). '"'"/i. 



» 4. Longitudinal section of the wall of the frond with gametangia and so-calied paraphyses. ^""/i- 



» 5. Lo\ver part of a hair. *"%. 



Lithoderma fatiscens. Fig. 6—7. 



Fig. 6. Transverse section of a part of the frond bearing zoosporangia. *""/i- 

 » 7. Stånd of gametangia. '"'%. 



