Sinnott. — The Evolution of the Filicinean Leaf -Face. 19 1 
14. Gwynne-Vaughan, D. T. : Observations on the Anatomy of Solenostelic Ferns. I. Loxsoma. 
Ann. Bot., vol. xv, 1901. 
15. : Ditto. II. Ann. Bot., vol. xvii, 1903. 
16. : On the Anatomy of A rchcingiopteris Henry i and other Marattiaceae. 
Ann. Bot., vol. xix, 1905. 
17. Jeffrey, E. C. : The Structure and Development of the Stem in the Pteridophyta and Angio- 
sperms. Phil. Trans. Roy. Soc. B, vol. cxcv, 1902. 
18. Karsten, IT. : Vegetationsorgane der Palmen. 
19. Kidston, R., and Gwynne-Vaughan, D. T. : On the Fossil Osmundaceae. Trans. Roy. Soc. 
Edin., vol. xlv, 1907. 
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Leipzig, 1881. 
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vol. cciv, 1901. 
23. Tansley, A. G. : Lectures on the Filicinean Vascular System. New Phytologist, Reprint 
No. 2, Cambridge, 1908. 
24. Thomae, K. : Die Blattstiele der Fame. Jahrb. f. wiss. Bot., xvii. 
DESCRIPTION OF FIGURES IN PLATE XI. 
Illustrating Mr. Sinnott’s paper on the Filicinean Leaf-trace. 
A cross indicates the position of the protoxylem in the text-figures ; an arrow, in the photographs. 
Fig. 12. The base of a leaf-trace of Todea hymenopliylloides. x 120. 
Fig. 13. The base of a leaf-trace of Helminthostachys . x Bo. 
Fig. 14. The base of a leaf-trace of Danaea. x 40. 
Fig. 15. The attachment of a leaf-trace of Gleichenia Speluncae. x 150. 
Fig. 16. The attachment of a leaf-trace of Gleichenia circinata v. macrophylla. x 70. 
Fig. 17. The base of one of the two leaf-traces of Onoclea sensibilis. x 100. 
Fig. 18. The attachment of the leaf-trace in a very young plant of Pteris aquilina. A root- 
trace is inserted with it. x 80. 
Fig. 19. The attachment of a leaf-trace in an older individual of the same species. A root- 
trace is present here as well, x 150. 
Fig. 20. The base of a leaf-trace of Asplenium Filix-foe 7 nina. x 80. 
Fig. 21. Petiolar bundle of Aspidiu?n spinulosum. x 15. 
Fig. 22. Petiolar bundle of a very young leaf of Aspulium cristatum. x 40. 
Fig. 23. Bundle in the base of the petiole of Lyginodendron Oldhamium. x 40. > 
