. Nature and development of plants. Botany. ii6 NATURE OF THE SPOROPHYLLS sporophylls are the important organs of the flower. The calyx and corolla may be lacking but no seed can be formed without the sporophylls. 51. The Structure of the Sporophylls.âLet us examine the structure of these organs and see how they co-operate in the formation of the seed. The stamens consist of a lobed sack or anther which is usually supported upon a stalk or filament ( Fig. 74. Flower of the stonecrop, Sedum: A, bud stage of flowerâca, â fcalyx showing three sepals. B, open flowerâp, petals of corolla; i, s
. Nature and development of plants. Botany. ii6 NATURE OF THE SPOROPHYLLS sporophylls are the important organs of the flower. The calyx and corolla may be lacking but no seed can be formed without the sporophylls. 51. The Structure of the Sporophylls.âLet us examine the structure of these organs and see how they co-operate in the formation of the seed. The stamens consist of a lobed sack or anther which is usually supported upon a stalk or filament ( Fig. 74. Flower of the stonecrop, Sedum: A, bud stage of flowerâca, â fcalyx showing three sepals. B, open flowerâp, petals of corolla; i, stamens; £, pistils or carpels. C, stamen, consisting of a four-lobed anther supported on delicate stalk or filament. D, pistil or carpelâ0, ovary; s, style which terminates in a small knob or stigma. E, longitudinal section of ovary showing row of ovules attached to wall of ovary. F, cross-section of ovary, ovules in two rows. 74, C). If a young anther is cut across four cavities, contain- ing minute or dust-like grains, the microspores, will be seen (Fig. 75, A). The microspores, also called pollen spores or grains, are minute cells, provided with a cell wall often variously sculptured and contain a nucleus and protoplasm like an ordinary cell (Fig. 79). At maturity the anthers break open in a manner. 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 Curtis, Carlton Clarence, 1864-1945. New York, H. Holt
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