. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. EQUISETINEM 451 separate lobes. A similar condition exists in Osmunda, where in the older prothallia similar but much shorter and broader lobes arise alternately from either side of the growing apex. The development of the archegonium is intimately associated with the formation of the lobes. The archegonium mother cell is formed close to the base of the young lobe upon the ventral side. By subsequent growth of the tissue between it and the apical meristem, it is subsequently forced to the uppe
. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. EQUISETINEM 451 separate lobes. A similar condition exists in Osmunda, where in the older prothallia similar but much shorter and broader lobes arise alternately from either side of the growing apex. The development of the archegonium is intimately associated with the formation of the lobes. The archegonium mother cell is formed close to the base of the young lobe upon the ventral side. By subsequent growth of the tissue between it and the apical meristem, it is subsequently forced to the upper side, but its origin is ventral, as in the Ferns. The lobe at whose base. Fig. 262.—Development of the archegonium. A, Optical section of the very young archegonial meristem, X225; B-E, longitudinal sections of young archegonia, X4S0; Cj neck canal cell; Vj ventral canal cell; 0, egg. it is borne grows for some time by a definite apical cell, which is very evident in horizontal sections (Fig. 263, C). The development of the archegonium most nearly resembles that of the eusporangiate Ferns. Usually, but not always, no basal cell is formed, and the first division in the inner cell sepa- rates the neck canal cell from the central cell. Both neck and ventral canal cells (Fig. 262, E) equal in breadth the central cell, and in this respect are most like the Marattiaces. The neck canal cell later grows up between the neck cells, but there is usually a space between its summit and the terminal neck. 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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