Fossil plants, Vol. 1: [A text-book] for students of botany and geology

by A. C. Seward

[435] Williamson (78) and (80).

[436] Conwentz (90) p. 119, Pl. XI. pp. 2, 3, Pl. XV. fig. 8.

[437] Migula (90) in Rabenhorst’s Kryptogamen Flora, vol. V.

[438] Vaillant (1719) p. 17.

[439] Migula (90) p. 53.

[440] Knowlton (89²).

[441] Meek (73) p. 219.

[442] Saporta (73) p. 214, Pl. IX. figs. 8–11.

[443] Seward (94²) p. 13, fig. 1.

[444] Woodward, H. B. (95) pp, 234, 261, etc.