KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 20. N:0 5. 339 
PLATE 18. 
Diploderma amplissimum. /y./—S. 
1. Part of the base of the frond, seen from the surface. 3%°/,. 
» 2. ‘Transverse section of the same part. %/). 
» & The sterile part of the frond, seen from the surface. 3°/,, 
» 4, ‘Transverse section of specimen 90 cm. long, at the middle of the frond. 3° , 
). ‘Transverse section at the middle of the specimen delineated pl. 17 fig. 3. 
» 6, Part of the plant, bearing sporocorps, seen from the surface. "| 
7. Part of the frond bearing sporocarps and antheridia, seen from the surface. °°"), 
» &. Transverse section of the same, %°/,. 
Diploderma miniatum. fy. 4. 
fig. 9. Transverse section of the sterile part of the frond. #°°/,. 
Porphyra abyssicola. Ig. 10—11. 
Fiy. 10. Part of the frond with sporocarps in development. %°°/,. 
» Ii. Transverse section of the same. %°/). 
PLATE .19. 
Fucus miclonensis. Jy. /—2. 
Fig. 1. Specimen from Nordlanden. }),. 
_» 2, Specimen from Finmarken.  '/). 
Fucus filiformis f. Gmelini. I. 3. 
Fig. 3. Specimen bearing receptacles, from Finmarken.  '/;. 
PLATE 20. 
Alaria dolichorhachis. 
Young specimen of the plant in natural size. 
PLATE 21. 
Alaria dolichorhachis. 
Fig. 1. Older specimen. 1/). 
» 2. Sporophyll.  '/). 
