. Foundations of botany. Botany; Botany. 248 FOUNDATIONS OF BOTANY under a power of 200 or more diameters. Select the terminal cell of the leaf if Chara is used. The protoplasm is nearly colorless but usually contains bodies which can be seen moving in the current of protoplasm. The protoplasm will show normal activity at the temperature of a comfortable living room. By focusing, see if the current of protoplasm can be detected moving in more than one direction. Note the form and arrangement of the chlorophyll and any places lacking chloro- phyll, and see if you can teU whether the arrangement
. Foundations of botany. Botany; Botany. 248 FOUNDATIONS OF BOTANY under a power of 200 or more diameters. Select the terminal cell of the leaf if Chara is used. The protoplasm is nearly colorless but usually contains bodies which can be seen moving in the current of protoplasm. The protoplasm will show normal activity at the temperature of a comfortable living room. By focusing, see if the current of protoplasm can be detected moving in more than one direction. Note the form and arrangement of the chlorophyll and any places lacking chloro- phyll, and see if you can teU whether the arrangement has any relation to the current of protoplasm. With a low power trace the course in several cells. How many cells con- stitute each intern ode of Nitella f If Chara is used, internodes will be found to be covered with a layer of many corticating cells. Under a high power compare the general structure of node and internode and see if the attachment of leaves and branches can be clearly determined. Compare the tip of a leaf with the tip of a stem or branch if the material permits. Are the fruiting organs produced on the stems or the leaves? 288. Antheridia. — The antheridia are globular bodies, bearing male fertilizing ceUs and becoming red at maturity (Fig. 182). Eight cells compose the outer wall. They have radial lines indicating folds and join one another by irregular sutures. Note a round spot in the middle of each cell which marks the point of attachment within of the stalk on which antherozoid-producing cells are'borne. 289. Oogonia The egg-shaped fruits, known as oSgonia (Fig. 182), are borne near the antheridia in monoecious species. Count thS number of pointed cells which constitute the " crown " of the fruit. Does each tip consist of one or two short cells ? Examine. Fig. 181. — End of a Main Shoot of Chara. (About natural size.). Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability -
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