12 



completing the range of the latter species along southern 

 Australia. 



2. A description is given of the' 'association in which 

 Isoetes and Phylloglossum occur together. It is regarded as a 

 seasonal swamp developed upon alluvial soil within the forma- 

 tion of sclerophyllous woodland. 



3. In South Australia both genera are members of a 

 considerable geophilous element within this association. 



Literature Cited. 



1. Bentham, G. : "Flora Australiensis," 1878, vol. vii., 



p. 672. 



2. Bertrand, C. E. : Arch. Bot. du Nord de la France, 



1884. 



3. Bower, F. O. ; Phil. Trans. Roy. Soc. London, 1886, 



vol. 176. 



4. Cheeseman, T. F. : "Manual of the New Zealand Flora," 



1906, p. 1032. 



5. Diels, L. :' "Die Pflanzenwelt von West Australien," 



1906, p. 256. 



6. Ewart, A. J., and Bees, B. : Proc. Roy. Soc. Vict., 



1913, vol. 26, p. 5. 

 7ii Maiden, J. H.,, and Betche, E. : ^ "A- Census of New 



South Wales Plants," 1916: 

 8. Mueller, F. von: "Key to the System of Victorian 



Plants/' 1888. 

 9^ Osborn, T. G. B. : New Phytologist, 1914, vol. xiii., 



p. 109. 



10. Sadebeck in Engler and Pratl "Die Naturlische Pflan-' 



" zenfamilien," 1902, I. Teil,JV. Abteil, p. 756. 



11. Sampson, K. : Annals of Botany, 1916, vol. xxx., p. 315. 



12. Thomas, A. P. W. : Proc. Roy. Soc. London, 1902 r 



. vol. lxix., p. 285. 



13. Warming, E. : "Oecology of Plants," 1909. 



DESCRIPTION OF PLATE I. 



Fig. 1." „£reriferal view of a portion of the area discussed. In 

 the centre is a large- ■ tree of Eucalyptus leucoxylon, small trees 

 in foreground Atacia pycnantha. The bulk of the grass-like vege- 

 tation is Sehoenus apogon, low shrubby plants Hibbcrtia. The 

 white flowers are Sparaxis. The dense vegetation in the imme- 

 diate background is developed along a creek bed. 



Fig. 2. Phylloglossum Drummondii plants growing in situ. 

 Four fertile plants are to be seen with the peduncles elongated to 

 two or three times the length of the leaves. The strobili are ripe. 



