. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. S42 MOSSES AND FERNS CHAP. vividly the endosperm formation of most Angiosperms. On account of the extremely thin walls and dense contents of the A. Fig. soetes echinospora van Braunii. A, Longitudinal section through the apex of the female prothallium, showing the first cell formation, X300; B, similar sec- tion of a prothallium with the divisions completed and the first archegonium iar) already opened. young prothallial cells it is not easy to determine exactly when the whole spore cav

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. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. S42 MOSSES AND FERNS CHAP. vividly the endosperm formation of most Angiosperms. On account of the extremely thin walls and dense contents of the A. Fig. soetes echinospora van Braunii. A, Longitudinal section through the apex of the female prothallium, showing the first cell formation, X300; B, similar sec- tion of a prothallium with the divisions completed and the first archegonium iar) already opened. young prothallial cells it is not easy to determine exactly when the whole spore cavity becomes filled up with cellular 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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Keywords: ., bookauthorcampbelldouglashought, bookcentury1900, bookdecade1910