. Morphology of gymnosperms. Gymnosperms; Plant morphology. Figs. 299, 300.—Thuja occidentalis: archegonium complex; fig. 299, longitudinal section of upper portion of endosperm with three of the elongated archegonium initials; X4S0; fig. 300, later stage with necks breaking down; the nuclei of the central cells have not yet divided to form the ventral canal nucleus and the egg nucleus; the pollen tube, with its body cell and stalk and tube nuclei, has almost reached the archegonium coiQDlez: X.S40.—^After Land (72).. Please note that these images are extracted from scanned page images that ma
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