151, MOEPHOLOGT or THE GENUS MTSTEOPETALON. 



Baillon, H. — Natural History of Plants. Eng. Ed., vol. vi. p. 505. 



Engler, E. — Pflanzenfamilien, vol. III. i. (1889) p. 252. 



Marloth, E. — "Das Kapland, insoiiderlieit das Reicli der Kapflora." Wiss. Ergeb. d. dent. Tiefsee^ 



expedition au£ dem Dampfer ' Valdivia/ 1898-99, vol. ii. pt. 3, p. 301. 

 GoEPPERT, H. R. — " Ileber den Ban der Balanophoreen." Verli. Leopold. -Carol. Akad. d. Nat 



xviii. Supp. 1, 1841, pp. 231-272, tt. 1-3. 



SOLEREDER, H. 



(1908) 



Pierce, Gr. J. — " On the Structure of the Haustoria of some Phanerogamic parasites." Ann. Bot 



vol. vii. (1893) pp. 291-327, tt. 13-15. 



EXPLANATION OP THE PLATES. 



Plate 15. 



Fig. 1. Rhizome and flowering axis of Mystropeialon Sollyi, n. sp., showing attachment to root of 



Protea sp. (nat. size). 



2. Young rhizomes, in various stages of development, on a Protea root (nat. size). 



3. Transverse section of a young Protea root (^P) with the rhizome and haustoriura of 



Mystropetalon. a, xylem and s, sclerotic fibres in host root. ( x 16.) 



4. Transverse section of a Protea root with entering haustorium. Centrally the deformed xylem 



L 



of the host root ; b^ ^'mystrin" cells ; bj\ bast fibres of host root ; $, sclerotic tissue of the 

 cortex ; ck, cork layer ; p, phloem parenchyma and sieve-tubes of the haustorium ; 

 Xj tracheitis of the haustorium. ( x 60.) 



5. Tracheids mingled "with "mystrin^^ cells from the haustorium. (x 350.) 



6. Tracheids (reticulate)^ "mystrin" cells, and phloem elements from the rhizome. ( X 550.) 



7. Transverse sectiou of the base of the flowering axis (x 16) ; a^ vascular strand ; bj '*^ mystriu 



cells, (x 16.) 



8. Superficial layers of the stem cortex showing the ^^ mystrin^' deposits, (x 550.) 



ji 



Plate 16. 



Fig. 9. Transverse section of one of the smaller vascular bundles of the flowering axis, b, ^^mystrin^^ 



cells ; X, xylem ; ph^ phloem. ( x 550.) 



10. Transverse section of one of the larger vascular bundles of the flowering axis (lettering as in 



fig. 9). (X 250.) 



11. Transverse section of one of the scale leaves, (x 60.) 



12. Longitudinal section of one of the vascular strands of the floral axis, showing xylem elements, 



phloem, and ^^mystrin" cells, (x 550.) 



13. Male flower, (x 35.) 



14. Section of the wall of the anther with pollen grains, (x 350.) 



15. Pollen grains, six- and seven-sided. ( x 550.) 



16. Abortive ovary of the male flower, (x 350.) 



17. Female flower, (x 60.) 



18. Longitudinal section of the perianth and style of the female flower, showing abortive stamens 



(semidiagrammatic). 



19. Trilobed stigma, (x 350.) 



20. Transverse section of fruit-wall and portion of the endosperm. ( x 550.) 



2L Longitudinal section of the fruit, showing the " torus," fruit-M all, endosperm, and embryo. 



( X 60.) 



