68 DR. J. D. HOOKER ON THE GENERA AND SPECIES OF BALANOPHORE^. 



Tab. XVI. 



Helosis Mexicana, Liebm. 

 Fig. 1. Bud of male flower. 

 Fig. 2. More advanced male flower. 



Fig. 3. Fully formed male flower with the lobes of the perianth spreading. 

 Fig. 4. Young synema. 

 Fig. 5. Fully formed synema. 

 Fig. 6. Pollen-grains. These are probably incorrectly represented ; the appearance of pollen-tubes may 



be due to the presence of the mycelium of a fungus : these and the pollen-grains were black. 

 Fiff. 7. Tube of the male perianth laid open, showing the conical rudiment of an ovarium at its base. 

 Fi"s. 8, 9 & 10. Very young state of female flowers with articulated filaments, showing the compound 



nature of the ovarium. 

 Fig. 11. Fully formed but immature female flower, with the limb of the perianth laid open. 

 Fig. 12. Another female flower of a different form. 

 Fig. 13. Vertical section of young female flower showing the albumen of the seed to be already formed, 



apparently before fecundation has taken place. 

 Fig. 14. Mature female flower. 



Fig. 15. Vertical section of the same, showing the pendulous ovule. 

 Fig. 16. Apex of style and stigma. 

 Fig. 17. Vertical section of nearly ripe fruit. 

 Fig. 18. Transverse section of ditto with the seed removed. 

 Fig. 19. Seed. 



Fig. 20. Transverse section of ditto. 



Figs. 21 & 22. Articulated filaments, showing the bladdery membrane enclosing the uppermost cells. 

 Fig. 23. Apex of the same more highly magnified. 

 Fig. 24. Apex of another articulated filament. 

 Fig. 25. Transverse section of portion of rhizome : a. vascular axis ; b. medullary sheath ; c. vascular 



wedge ; d. liber ; e. sclerogen-cells. 

 Fig. 26. Vertical sections of tissues forming the vascular system from the axis to the circumference: 



a. pleurenchyma that occupies the axis ; b. medullary sheath ; c. vascular wedge of wood 



formed of angular thin-walled vessels ; d. liber-cells ; e. cellular tissue. 

 Fig. 27. More highly magnified vessels of axis or pith. 

 Fig. 28. Ditto of wood. 



Fig. 29. Transverse section of vascular system ; — the letters refer to the same tissues as in fig. 26, 

 Fig. 30. Section of stem of Helosis Guyanensis from Brazil (Mr. Miers), showing the supplementary 



liber-bundles alternating with those first formed. 

 All very highly magnified. 



