. The geological history of plants. Paleobotany; 1888. n THE GEOLOGICAL HISTORY OF Fio. 22.—Brian ferns (New Brunswick). A, Aneimites obtusa. 0, jfeuropteris 'poly- morpha, T, Sphenopterit pilosa. N, Mymenophyllites subfurcatus. Another group of plants which attained to great development in the Brian age is that of the Perns or Brackens. The oldest of these yet known are found in the Mid- dle Erian. The Eopteris of Sa- porta, from the Silurian, at one time supposed to carry this type much further back, has unfortu- nately been found to be a mere imitatiye form, consisting of films of
. The geological history of plants. Paleobotany; 1888. n THE GEOLOGICAL HISTORY OF Fio. 22.—Brian ferns (New Brunswick). A, Aneimites obtusa. 0, jfeuropteris 'poly- morpha, T, Sphenopterit pilosa. N, Mymenophyllites subfurcatus. Another group of plants which attained to great development in the Brian age is that of the Perns or Brackens. The oldest of these yet known are found in the Mid- dle Erian. The Eopteris of Sa- porta, from the Silurian, at one time supposed to carry this type much further back, has unfortu- nately been found to be a mere imitatiye form, consisting of films of pyrites of leaf-like shapes, and produced by crystallisation. In the Middle Erian, however, more especially in North Ameri- ca, many species have been found (Pigs. 22 to 24).* I have myself recorded more than thirty spe- cies from the Middle Erian of Canada, and these belong to sev- eral of the genera found in the Carboniferous, though some are peculiar to the Erian. Of the latter, the best known are per- haps those of the genus Archm- opteris (Fig. 24), so abundant in the plant-beds of Kiltorean in Ireland, as well as in North America. In this genus the fronds are large and luxuriant, with broad obovate pinnules de- current on the leaf-stalk, and with simple sac-like spore-cases borne on modified pinnae. An- other very beautiful fern found * For descriptions of these ferns, see reports cited Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Dawson, John William, Sir, 1820-1899. New York, D. Appleton and Company
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