. Lectures on the evolution of plants. Botany; Plants. 62 EVOLUTION OF PLANTS th^ cell, and the cells have long been favorite subjects for demonstrating this phenomenon. The original nucleus of these elongated cells becomes early divided into many, but these secondary nuclei are not formed. Via, 14.—A, a plant of Chara, one of the Characese, showing the division of the stem into nodes and internodes, and the method of branching; B, part of a leaf with an antheridium an, and oogonium, og; I, leaflets^ at the node of the leaf; C, a group of filaments from the interior of the antheridium; each ce
. Lectures on the evolution of plants. Botany; Plants. 62 EVOLUTION OF PLANTS th^ cell, and the cells have long been favorite subjects for demonstrating this phenomenon. The original nucleus of these elongated cells becomes early divided into many, but these secondary nuclei are not formed. Via, 14.—A, a plant of Chara, one of the Characese, showing the division of the stem into nodes and internodes, and the method of branching; B, part of a leaf with an antheridium an, and oogonium, og; I, leaflets^ at the node of the leaf; C, a group of filaments from the interior of the antheridium; each cell of the long filament contains a hiciliate spermatozoid; T>, a section through the node of a young leaf showing the young antheridium, an, below the oogonium, og; E, a single spermatozoid; F, a longitudinal section of the stem-apex, showing the apical cell, v, from the division of which all the parts of the plant arise; x, the nodes, y, the internodes. by the ordinary nuclear division, or karyokinesis, but result from a direct constriction, or fragmentation of the primary nucleus, a phenomenon which has also been met with in the elongated cells of the stems of some flowering 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, London, The Macmillan company
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Keywords: ., bookcentury1900, bookdecade, booksubjectbotany, booksubjectplants
