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

by A. C. Seward

[632] Potonié (01²) figs. 25–27.

[633] Nathorst (02) p. 35.

[634] Seward (03) Pl. XI. figs. 1–6, p. 87; Arber (05) p. 166.

[635] Seward (09).

[636] Feistmantel (90) A.

[637] Zeiller (80²) A.

[638] Trautschold and Auerbach (60) Pl. III.

[639] Zeiller (82) A.; (86).

[640] Nathorst (94) A. Pls. X. XI.

[641] Volume I. p. 134.