. Elementary botany. Botany. Fig. 291. Sepal, petal, stamen, and pistil of Trillium grandiflomm, 444. The stamen a sporo- phyll.—Since these pollen grains are the spores, we would infer, from what we have learned of the ferns and gym- nosperms, that this member of the flower which bears them is a sporophyll; and this is the case. It is in fact what is called the microsporophyll. Then we see also that the anther sacs, since they enclose the spores, would be the sporangia (microsporangia). From this it is now quite clear that the stamens belong also to the leaf series. They are just six in numbe
. Elementary botany. Botany. Fig. 291. Sepal, petal, stamen, and pistil of Trillium grandiflomm, 444. The stamen a sporo- phyll.—Since these pollen grains are the spores, we would infer, from what we have learned of the ferns and gym- nosperms, that this member of the flower which bears them is a sporophyll; and this is the case. It is in fact what is called the microsporophyll. Then we see also that the anther sacs, since they enclose the spores, would be the sporangia (microsporangia). From this it is now quite clear that the stamens belong also to the leaf series. They are just six in number, twice the number found in a whorl of leaves, or sepals, or corolla. It is belie-^ed, therefore, that there are two whorls of stamens in the ilower of trillium. 445. GyncEcium.—Next above the stamens and at the center of the flower is a stout, angular, ovate body which terminates in three long, slender, curved points. This is the pistil, and at. Fig. 292. Trillium gran- diflomm, with the compound pistil expanded mto three leaf- like members. At the right these three are shown in 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
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