. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. 6o6 MOSSES AND FERNS' CHAP. To summarise briefly: the conclusion reached is that the Spermatophytes represent not one single line of development, but at least two, and perhaps more, entirely independent ones, having their origin from widely separated stocks. The Gymno- sperms (at least the Conifers) are probably direct descendants of some group of Lycopods allied to the Selaginellacese, or Lepidodendracese, while the origin of the Cyads and Angio- sperms is to be looked for among the eusporang

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. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. 6o6 MOSSES AND FERNS' CHAP. To summarise briefly: the conclusion reached is that the Spermatophytes represent not one single line of development, but at least two, and perhaps more, entirely independent ones, having their origin from widely separated stocks. The Gymno- sperms (at least the Conifers) are probably direct descendants of some group of Lycopods allied to the Selaginellacese, or Lepidodendracese, while the origin of the Cyads and Angio- sperms is to be looked for among the eusporangiate Filicinese. .Angiosperma Conilera Marsiliaceaf. SphagnaleT'. 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 Campbell, Douglas Houghton, 1859-1953. New York, The Macmillan Company;

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