KONGL. «V. VET. AKAUEMIENÖ HANDLINGAR. BAND. 20. N:u 5. 339 



PLATE 18. 

 Diploderma amplissimum. Fig.1—8. 



Fiij. 1. Part of llie basc of thc froiid, seen from tlie surface. '""'/i- 



» 2. Transverse section of the same part. '"'Vi- 



" 3. Tlie sterile part of the froiid, seen from the surface. "^""/'i- 



" å. Transverse section of speciraeii 90 cm. long, at the middle of the frond. ■*"%. 



» 5. Transverse section at the middle of the speciraen delineated pl. 17 tiy. 3. 



n 6. Part of the plant, bearing sporocorps, seen from the surface. '"'%. 



» 7. Part of the frond bearing sporocarps and antheridia, seen from the surface. •""'/] . 



') 8. Transverse section of the same. ^"Vi- 



Diploderma miniatum. Fuj. 9. 



Fig. 9. Transverse section of the sterile part of the frond. '"'Vi. 



Porphyra abyssicola. Fig. 10—11. 



Fiij. 10. Part of the frond with sporocarps in developraent. ^"Vi- 

 » 11. Transverse section of the same. ^""/i. 



PLATE 19. 

 Fucus miclonensis. Fig. 1—2. 



Fig. 1. Specimen from Nordlanden. Vi- 

 » 2. Speciraen from Finmarken. Vi- 



Fucus filiformis f. Gmelini. Fig. 3. 



Fig. 3. Specimen bearing receptaclcs, from Finmarken. Vi- 



PLATE 20. 

 Alaria dolichorliacliis. 



Young specimen of the plant in uatural size. 



PLATE 21. 

 Alaria dolichorhaohis. 



Fig. 1. Older speciraen. Vi- 

 " 2. Sporophyll. Vi- 



