. Lessons in botany. Botany. 170 BOTANY. of the cells. The growing point remains at the middle of the advancing margin, and the cells which are cut off from either side, as they become old, widen out. In this way the '' wings,'' or margins of the little, green, flattened body, are. Fig. 142. Germinating spores of Pteris aquilina still in the sporangium. Fig. 143- Young prothallium of a fern (nipho- bolus). in advance of the growing point, and the object is more or less heart-shaped, as shown in fig. 139. Thus we see how the prothallium of ferns is formed. 280. Sexual organs of ferns.—If we tak
. Lessons in botany. Botany. 170 BOTANY. of the cells. The growing point remains at the middle of the advancing margin, and the cells which are cut off from either side, as they become old, widen out. In this way the '' wings,'' or margins of the little, green, flattened body, are. Fig. 142. Germinating spores of Pteris aquilina still in the sporangium. Fig. 143- Young prothallium of a fern (nipho- bolus). in advance of the growing point, and the object is more or less heart-shaped, as shown in fig. 139. Thus we see how the prothallium of ferns is formed. 280. Sexual organs of ferns.—If we take one of the prothallia of ferns which have grown from the sowings of fern spores, or one of those which may be often found growing on the soil of pots in conservatories, mount it in water on a slip, with the. 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 Atkinson, George Francis, 1854-1918. New York, H. Holt and company
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