The Geological History of Plants

by Sir John William Dawson

[AX] “Reports on Fossil Plants of the Devonian and Upper Silurian of Canada,” 1871, &c.

Fig. 23.—Erian ferns (New Brunswick), B, Cyclopteris valida, and pinnule enlarged, D, Sphenopteris marginata, and portion enlarged. E, Sphenopteris Harttii. G, Hymenophyllites curtilobus. H, Hymenophyllites Gersdorffii, and portion enlarged. I, Alethopteris discrepans, K, Pecopteris serrulata, L, Pecopteris preciosa. M, Alethopteris Perleyi.

Fig. 24.—Archæopteris Jacksoni, Dawson (Maine). An Upper Erian fern, a, b, Pinnules showing venation.