Plate XVI. 



Figs. 1—3. Sargassaiii n'Kjri/oliaiii. 



1. A young steriK^ branch. 



2. Midillo portion of a luU-grovvn i'rond, showing Ç fertile hiteral 

 branches. 



3. Part of a fertile lateral branch to show the arrangement of re- 

 ceptacular ramiilets. 



Fig. 4. Sargassmn (jramiin folium Ag. 



A fertile lateral branch, from a specimen from Prov. of Awa. 



Of. text p. 130. 

 Figs. .5-9. SargaHsma llicifolium var. dupUcaturn J. Aa. 



5. . Eeceptacular ramnlet, with most of tlie recei)tacles spinescent. 



Oa. X 2. (from a specimen collected at Hiratsuka, Prov. of tSagami). 



6. The same, with some of the receptacles smooth; from the same, 

 branch which bears the ramulet shown above. Ca. x 2. 



7. A fertile lateral branch, probably of the present s[)ecies. (From 

 a specimen from Prov. of Tosa. Cf. Text, p. 132). J. 



8. A receptacular rauDulet of the same. Ca. x 2. 



9. A receptacle cluster enlarged. 



Figs. 10-14. Sargassuoit heriherifoliiwi J. Ag. 



10. Basal part of a well-developed plant. 



11. A fertile lateral branch in the middle [)art of a branch. 



12. The same with a vesicle. 



13. A receptacle cluster enlarged. 



14. A typical leaf. 



Figs. 15-16. Sargassum cinctiom J. Ag. ? 



15. A fertile lateral branch. ^ . 



16. A receptacle cluster enlarged. 

 Fig. 17. Sargasswii microphylhim Ag. ? 



a, h. Two receptacular ramulets, (Ja. x 4. 

 Figs. 18-19. Sargassum aqwi/oUuvi forma. ? 



18. A part of a fertile lateral branch. Ca. x 2. 



19. A recei)tacle cluster. Ca. x 3. 

 Fig. 20. Sargassum hiishimotcnse. 



A part of the frond showing two sterile lateral branches. 



