PLATE 48.— Vegetable Tissues. 



Figure 



1. Wood of Pinus sylveslris. a, radial vertical section ; b, tangential section of 



the walls of two contiguous pitted wood-cells. 



2. Tangential section of the wood of Casuarina equisetifolia. a, pitted wood-cells ; 



b, duct ; c, cells of a true medullary ray ; d, cells of one of the concentric 

 medullary layers. 



3. Vertical section of wood-cells of box. 



4. Vertical (radial) section of wood-cells of the yew. 



5. Vertical (radial) section of wood-cells of Araucaria imbricata. 



6. Spiral-fibrous cells from the roots of Dendrobium alatum. 



7. Wood-cells of Mammillaria, with broad spiral bands. 



8. Spiral and annular vessels of rhubarb. 



9. Reticulated duct from the same. 



10. Scalariform duct of a tree fern. 



11. End of a spiral vessel of the white lily. 



12. Fragment of a larger and looser one. 



13. Pitted duct of the lime (Tilia parvifolia).' 



14. Wall of a pitted duct of Cassyta glabella. 



15. Walls of pitted ducts of Bombax pentandrum. a, next another duct ; b, next 



cells. 



16. Wall of a pitted duct of Laurus Sassafras. 



17. Wall of a pitted duct of Chiliauthus arboreus. 



18. Walls of pitted ducts of clematis (Clematis Vitalba). 



19. End of a spiral-fibrous duct oi Daphne Mezereon. 



20. Walls of pitted wood-cells of Cycas. 



21. Fragment of the wall of a large pitted duct of Eryngium maritimum. 



22. Vertical section through a stoma of Aloe ferox ; the darkly shaded part repre- 



sents the cuticular layer. 



23. Fragment of a latex-duct of Euphorbia antiquorum, the latex containing starch- 



grains of peculiar shape. 



24. Epidermis of the petal of the daffodil, from above. 



25. Fragment of the leaf of Sphagnum cymbiforme. a, empty cells with spiral 



fibre ; b, interstitial cells with chlorophyll. 



2G. Vertical section of the tapper face of the leaf of Parietaria officinalis, with a 

 cystolith ; magnified 100 diameters. 



27. A similar section from the leaf of Ficus elastica ; magnified 100 diametors. 



28. a and b, sections of the cellular tissue of an onion-bulb, containing raphides. 



29. Stomata and epidermis of Equisetum; the siliceous coat remaining after the 



destruction of the organic matter. 



30. End of a liber-fibre of the periwinkle (Vinca major), with fine spiral striae. 



31. Branched liber-cell of the radicle of Bhizophora Mangle. 



32. Siliceous cast of the inside of a duct of unknown fossil wood ; tho peculiar 



concentric concretions of the silica imitate to a certain extent the so-called 

 glandular markings of Coniferoe. 



