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

[895] Brongniart (22), p. 234, Pl. II. fig. 8.

[896] Brongniart (28), p. 68.

[897] Bischoff (28), Pl. XIII. fig. 1.

[898] Römer, F. (62), p. 21, Pl. V. fig. 2.

[899] Sterzel (86), pp. 26, 27, etc.

[900] Kidston (93), p. 333.

[901] Zeiller (88), p. 414.

[902] Ibid. p. 411.

[903] Weiss (84), p. 201, Pl. XXI. fig. 12.

[904] Solms-Laubach (95⁴), p. 232.