324 DIPTERIDACEAE [ch. xxxiv 



580. Bower. Origin of a Land Flora, p. 618. 1908. 



581. Seward. Fossil Plants, ii, p. 380. 1910. 



582. Bower. Studies in Phylogeny. V. Ann. of Bot. xxix, p. 109. 191 5. 



583. Bower. Leaf Architecture. Trans. Roy. Soc. Edin. li, p. 687. 1916. 



584. Halle. Sporangia of some Mesozoic Ferns. Arch. Bot. K. Svensk. Vetenkaps- 

 Akad. Hand. Bd. 17, No. i. 1921, where there are full references to the fossil 

 literature. 



585. Hamshaw Thomas. Dictyophyllumrugosum. Proc. Camb. Phil. Soc. 1922, p. 109. 



586. Seward. Hooker Lecture. Linn. Soc. Journ. xlvi, p. 219. 1922. 



