64 DR. J. D. HOOKER ON THE GENERA AND SPECIES 



Fig. 13. Vertical section of more advanced ovary. 

 Fig. 14. Immature seed. 



Fig. 15. Apex of style, and pollen-grain ; 15 a, cells of apex of style before impregnation. 

 Fi". 16. Base, & fig. 17- apex of style, with pollen-tube traversing it. 

 Fi^s. 18 & 19. Male flowers with 2-lobed perianths. 

 Figs. 20 & 21. Male flowers with 3-lobed perianths. 

 Fi". 22. Imperfect male flowers showing their reduction to bracts. 

 Fig. 23. Vertical section of male flower. 

 Fig. 24. Pollen-grains. 

 Fig. 25. Acarus found on the capitulum. 

 All very highly magnified. 



Tab. VI. 



Balanophora involucraia, Hook. fil. 

 Fig. 1. A young plant which has already caused the root upon which it grows to enlarge very much. 

 Fig. 2. Vertical section of the same. 

 Fig. 3. Very highly magnified view of the root and portion of the Balanophora, showing the mode of 



attachment, displacement of the woody system of the root, and apparent interlacement of the 



vascular systems of the root and parasite : a. indicates the bundles of the peduncle, b. of the 



rhizome. 

 Fig. 4. Very highly magnified slice of the root and parasite at the point of attachment of the latter. 

 Fig. 5. Transverse section of the root from near the swollen portion, showing the separation of the bark 



and wood. 

 Fig. 6. Woody system of the root. 

 Fig. 7- Vertical section of an exceedingly young Balanophora, nidulating in the cellular bark of a root: 



a. spongioles ; b. position of the nascent vascular bundle in its axis. 



Fig. 8. Vertical section of a more advanced, but still very young Balanophora, which has apparently ger- 

 minated on one of the large tubers that this species eventually forms on the roots of maples, &c., 

 and which tuber consists of a confused mass of the tissues of the parasite and root : a, spongioles ; 



b. nascent vascular bundles in its axis ; c. root traversing the mass ; d. cellular tissue of parasite. 

 Fig. 9. Vessels and cells of the vascular bundle taken from fig. 8 b. 



Fig. 10. Section at point of union of root, a, and parasite, b. 

 Fig. 11. Vascular tissue of the wood of the root taken from fig. 8 c. 

 Fig. 12. Very young vascular tissue from the axis of fig. 7- 

 All but figs. 1 & 2 very highly magnified. 



Tab. VII. 



A. Male plants of Balanophora involticrata, var. gracilis, growing on the roots of an Oak. 1. male, and 



2. female plant. 



B. Male and female plants of B. involucrata, var. Cathcartii. 

 Fig. 1 . Male flower magnified. 



Tab. VIII. 



Balanophora fungosa, Forst., from N.E. Australia. 



Fig. 1. Plant of the natural size, but the flowers not fully developed. 



Fig. 2. Male flower. 



Fig. 3. Synema. 



Fig. 4. The same with the anthers dehisced. 



