Fossil plants, Vol. 2: A text-book for students of botany and geology

by A. C. Seward

[42] Another form of abnormality in the sporophylls of Psilotum has recently been described by Miss Sykes. Sykes (08²).

[43] Bertrand, C. E. (81); Ford (04).

[44] Boodle (04).

[45] See p. 150.

[46] Bertrand (81); Jennings and Hall (91).

[47] Sykes (08).

[48] ibid. (08).

[49] Lignier (08).

[50] Bower (94); (08).

[51] Bertrand (81) p. 254.