Plate XV. 



Figs. 1-4. Sargassimi Kjellmaniarmm. 



1. Basal [»art of a plant, with a very yoiiny; branch at the base. 



2. Middle portion of a branch with a fertile lateral branch. 



3. A fertile rauuilct. ca. x 3. 



4. A part of a fertile ramulet showing the vesiculiferons recep- 

 tacles, ca. X 3. 



Fig. 5, Sargassum Tlmnhergii f. nipponica. 



A portion of a principal branch, showing three nodes and two 

 stunted fertile ramulets. In the right hand rannilet the fnlcrant 

 leaf is filiform lanceolate, and in the left hand one it assumes 

 a vesicular form. ca. x 5. 



ft'igs. 6-9. Sargassum kiushianum. 



G. Middle portion of a frond, with a cross-section of the stem. 



7. A receptacle with a leaf at the basal part of its stipe. The 

 leaf as well as the fnlcrant leaf is partly shown, ca. x 4. 



8. Eeceptacles seen from the elevated side. ca. x 4. 

 \). Cross section of receptacle, ca. x 5. 



Figs. 10-17. Sargassum micracanthum (KiJTZ.) 



10. Basal part of a well-developed plant, with cross-sections of the 

 stem. Observe many young shoots are starting from the same 

 root. 



11. A typical lateral branch in the upper portion of a sterile frond. 

 J 2. The same near at the apical portion of a well-developed sterile 



frond. 



13. A fertile lateral branch in the upper portion of a fnll-grown frond. 



14. A fertile branch from a comparatively small plant. 



1.5. A fertile ramulet near the terminal portion of a frond. 

 IG. The same from a well-developed frond. 



17. Cross section of a J receptacle Ca. x 8. 

 Figs. 18-21. Sargassum micracanthum var. stipulata. 



18. Basal part of a plant. Observe the basal leaves are entire, as in 

 the typical form (fig. 10). 



19. A fertile lateral branch. 



20. Insertion point of well developed lateral branches, with one 

 fnlcrant leaf still remaining. Observe the vesicles are coronated 

 and slightly winged. 



21. A typical fulcrant leaf. 



