794 THE PROTHALLUS OF TMESIPTERIS TANNENSIS. 



As T now know how and when to obtain material, I have hopes of procuring a 

 fresh supply in the near future, and these details of the embryo will be carefully 

 studied. 



In conclusion, I beg to acknowledge my indebtedness to Dr S. J. Johnston, of the 

 Zoology Department, University of Sydney, who showed me where Tmesipteris was 

 growing at Bulli Pass, N.S.W. I am also greatly indebted to my friend Mr Darnell- 

 Smith, of the Bureau of Biology, Department of Agriculture, N.S.W. , who was kind 

 enough to show me where Tmesipteris grows abundantly at Sommerby Falls. At 

 both of these localities I found prothalli, two at Bulli Pass and one at Sommerby 

 Falls. To Mr John M'Luckie, B.Sc, of the Department of Botany, University of 

 Sydney, I am also indebted for some young sporophyte plants which he obtained at 

 Mount Wilson. 



LITERATURE CITED. 



1894. Bower, F. 0., "Studies in the Morphology of Spore-producing Members," Phil. Trans. Roy. Soc, 1894. 



1908. Bower, F. O., The Origin of a Land Flora, Macmillan & Co., London, 1908. 



1904. Boodle, L. A., "On the Occurrence of Secondary Tracheides in Psiloturn," Ann. Bot., vol. lxxi, 



p. 505, 1904. 

 1904. Boodle, L. A., New Phyfologist, 1904. 



1904. Ford, S. O., "The Anatomy of Psilotvm triquetrum," Ann. Bot., lxxii, p. 589, 1904. 

 1904. Lang, W. H., "On a Prothallus provisionally referred to Psilotnm," Ann. Bot., lxxii, p. 571, 1904. 

 1908. Scott, D. H., Studies in Fossil Botany, Black, London, 1908. 



DESCRIPTION OF FIGURES. 



Fig. 1. A portion of a prothallus of Tmesipteris as seen from the surface. 



Fig. 2. Another specimen seen from the surface and showing its branching. 



Fig. 3. Another specimen of prothallus seen from above and showing the characteristic rhizoids, 

 antheridia, and archegonia. 



Fig. 4. A section showing a few prothallial cells containing the endophytic fungus. 



Fig. 5. Another of the same showing the fungus more in detail. 



Fig. 6. A median section through the prothallus showing the distribution cf the archegonia on the 

 surface, the position of the embryo, and the distribution of the infection by the endophytic fungus. 



Fig. 7. Sections of two young antheridia. 



Fig. 8. A young antheridium seen in section more highly magnified. 



Fig. 9. A later stage in development of the antheridium as seen in section. 



Fig. 10. An antheridium seen from the surface. 



Fig. 11. An old antheridium from whicli the contents have been discharged. 



Fig. 12. A surface view showing four archegonia. 



Fig. 13. A mature archegonium ready for fertilisation and seen in section. 



Figs. 14 and 15. Older stages of the same. 



Fig. 16. A section through a portion of a prothallus containing an embryo. 



PRESENTED 



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