6 o 2 Duthie .• — Anatomy of Gnettim africanum . 
EXPLANATION OF FIGURES IN PLATES LVIKLIX. 
Illustrating Miss Duthie’s paper on the Anatomy of Gnetum africanum . 
PLATE LVII. 
Fig. i. Part of a transverse section of the stem, x 165. 
Fig. 2. Part of a longitudinal section of the stem, showing vessels of the xylem and medullary 
rays, x 500. 
Fig. 3. Part of a medullary ray with bridging xylem tracheides. x 500. 
Fig. 4. Transverse section of stem, showing irregular cork formation and cork rings. 
Fig. 5. Transverse section through node, showing leaf-trace bundles. 
Fig. 6. Photograph of skeleton of young leaf. Natural size. 
Fig. 7. Portion of above, x 3. 
PLATE LVIII. 
Fig. 8 a . Terminal wall of pitted vessel with row of circular perforations, x 375. 
Fig. 8 b, c. Terminal walls of segments of vessels, showing fusion of circular pits, x 375. 
Fig. 8 d-f. Terminal walls of vessels of old wood with single perforations, x 220. 
Fig. 9. Transverse section through phloem mass, showing radial rows of sieve tubes and 
albuminous cells, x 375. 
Fig. 10. Transverse section through a portion of a bundle, showing medullary ray cells packed 
with crystals of calcium oxalate, x 3 75. 
Fig. 11. Tangential section through medullary rays in phloem, x 375. 
Fig. 12. Transverse section through a portion of a bundle, showing albuminous cells packed with 
crystals of calcium oxalate, x 375. 
Fig. 13. Radial section through phloem, showing compound sieve plates on sloping terminal 
walls, x 375, 
Figs. 14 and 15. Tangential section through phloem, showing sieve tubes and albuminous cells, 
x 375- 
Fig. 16. Tangential section through phloem, showing short parenchymatous cells filled with 
crystals abutting on elongated albuminous cells, x 375. 
Fig. 17. Transverse section through phloem, showing large callus pads on walls of sieve tubes. 
x 375 ; 
Fig. 18. Tangential section through phloem, showing large callus pads on sloping end walls 
of sieve tubes, x 375. 
Fig. 19. Transverse section through part of stem, showing formation of phelloderm and cork in 
the ground tissue inside zone of stone cells, x 240. 
Fig. 20. Transverse section through part of stem, showing formation of mucilage cavity and 
secondary tissue inside zone of stone cells, x 240. 
Fig. 21. Portion of a transverse section of a stem, showing origin of phellogen in epidermis, 
x 375- 
Fig. 22. Surface view of stoma, x 800. 
PLATE LIX. 
Fig. 23. Median transverse section through sunken stoma of young stem, x 800. 
Fig. 24. Median transverse section through stoma of leaf, x 800. 
Fig. 25. Longitudinal section through stoma of leaf, x 800. 
Fig. 26. Transverse section through end of stoma of leaf, x 800. 
Fig. 27. Transverse section of stem cortex with fibres. The thickened walls are unshaded, x 375. 
Fig. 28 a. Bone-shaped end of elongated fibre of leaf, x 220. 
Figs. 28 b and 31. Fibres of leaf with short branches, x 220. 
Fig. 29. Branched acicular cell of leaf, x 220. 
Fig. 30. Cell of medullary ray with rhombic crystals of calcium oxalate, x 375. 
