Inter-relationships of the Phyla. 71 
Horsetails, Sphenophylls or Lycopods, a view supported by the 
absence of a megasporangiate strobilus in Cycas. 
LITERATURE QUOTED. 
1 . 
2 . 
3. 
4. 
5. 
6 . 
7. 
8 . 
9. 
10 . 
11 . 
12 . 
13. 
14. 
15. 
16. 
17. 
18. 
19. 
20. 
E. A. Newell Arber and H. H. Thomas. “ On the Structure of Sigillaria 
scutetiata, Brongn., and other Eusigillarian Stems, in 
comparison with those of other Palaeozoic Lycopods.” 
Proceedings of the Royal Society, Vol. 80, 1908. 
M. Benson. “The Sporangiophore —A Unit of Structure in the Pterido- 
phyta.” New Phytologist, 1908. 
L. A. Boodle. “ Some Points in the Anatomy of the Ophioglossaceae.” 
Annals of Botany, 1899. 
,, “ On the Occurrence of Secondary Xylem in Psilotum 
Annals of Botany, 1904. 
F. O. Bower. “ Studies in the Morphology of the Spore-producing 
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Philosophical Transactions of the Royal Society of 
London, Series B, Vol. 186, 1893. 
,, Ditto. “II. The Ophioglossaceae.” Dulau & Co., 1896. 
,, Ditto. “ III. The Marattiaceae.” Philosophical Tran¬ 
sactions of the Royal Society of London, Series B, 
Vol. 190, 1897. 
,, Ditto. “ IV. The Leptosporangiate Ferns.” Philo¬ 
sophical Transactions of the Royal Society of London, 
Series B, Vol. 192, 1899. 
,, Ditto. “V. General Comparison and Conclusion.” 
Philosophical Transactions of the Royal Society of 
London. Series B, Vol. 196, 1903. 
„ “The Origin of a Land Flora,” 1908. 
H. Bruchmann. “ Das Prothallium und die Sporenpflanze von Botry- 
chium Lunaria.” Flora, 1906. 
D. H. Campbell. “ Mosses and Ferns.” Second Edition, 1905. 
,, “ The Affinitiesof theGenus Equisetum." The American 
Naturalist, 1905. 
P. A. Dangeard. “ Memoires sur la morphologie et l’anatomie des 
TmJsipteris." Le Botaniste, Series II., 1892. 
S. O. Ford. “ The Anatomy of Psilotum triquetrum .” Annals of Botany, 
1904. 
T. G. Halle. “ Zur Kentniss der Mesozoischen Equisetales Schwedens.” 
Kungl. Svenska Vetenskapsakademiens Handlingar., 
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H. Hallier. “ Beitriige zur Morphogenie des Sporophylls und des Tropho- 
phylls in Beziehungzur Phylogenieder Kormophyten.” 
Jahrbuch der Hamburgischen Wissenschaftlichen 
Anstalten XIX., Beihefte 3, 1901. 
G. Hickling. “ On the Anatomy of Palceostacliya vera." Annals of Botany, 
1907. 
E. C. Jeffrey. “The Gametophyte of Botrychnm virginianum .” Annals of 
Botany, 1897. 
„ “ On the Structure and Development of the Stem in the 
Pteridophyta and Gymnosperms.” Philosophical 
Transactions of the Royal Society of London, Series 
B, Vol. 195, 1902, 
