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• W2057315256 abstract "1. The terminal bud of the short perennial rhizone of Dionaea forms a scape which bears a cymose inflorescence of from two to fourteen actinomorphic, pentacyclic flowers. 2. The arrangement of the vascular bundles of the stamens in the receptacle of young flowers is considered as further proof of Payer's statement that the stamens develop respectively in alternipetalous and epipetalous whorls. Moreover, when more than ten stamens (five in each cycle) develop, the vascular bundle of one or more of the five epipetalous stamens is divided and supplies the additional stamen or stamens. This is not in accord with the view held by Payer that dédoublement may occur in either whorl. 3. The four microsporangia of each stamen develop in the usual manner. 4. In the early prophase of the microsporocytes, of which forty-eight to sixty develop in each sporangium, prochromosomes are discernible. 5. Each of the four nuclei resulting from the second meiotic division of the microsporocyte has fifteen haploid chromosomes. 6. The mature pollen grains hang together in tetrads and each contains six to eight large germinating pores. 7. The paracarpous ovary of Dionaea, which is composed of five carpels, develops numerous anatropous ovules on a basal placenta, with the tip of each slightly imbedded in a cup-shaped bolster of placental or receptacular tissue. 8. The outermost layer of cells of the second integument forms an outer seed coat of closely packed, radially elongated, heavy-walled, columnar cells; while those cells of the inner integument which overtop the nucellus form a lid or cover which is pushed off when the seed germinates. 9. The single vascular strand which extends to the chalazal end of each ovule shows no tendency to turn or twist in its course. 10. The outer layer of nucellar cells, except where it overtops the prothallial cells, increases enormously in radial dimension, surrounding a central strand of longitudinally elongated cells. 11. By division of the single hypodermal archesporial cell, two or at most three layers of parietal cells are formed above the embryo sac. 12. Rarely more than a single megaspore mother cell is developed; the mother cell divides to form two, then four potential megaspores; the divisions of the daughter cells do not necessarily occur simultaneously. 13. Usually, as in other angiosperms, the three micropylar potential megaspores degenerate and the chalazal one functions. In one instance the three basal spores degenerated and the micropylar one functioned. 14. The embryo sac resulting from three successive divisions of the functional megaspore contains, when ready for fertilization, the usual egg apparatus, polar nuclei, and antipodals. 15. The primary endosperm nucleus usually completes several mitoses before the fertilized egg divides to form the embryo and suspensor. 16. As the endosperm increases it progressively encroaches upon the surrounding nucellar tissue, and by the time that free nuclear division has ceased in the former all nucellar tissue has disappeared. 17. The mature seed contains a small basal embryo, consisting of two cotyledons and a short radicle surrounded by the cellular endosperm." @default.
• W2057315256 created "2016-06-24" @default.
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• W2057315256 date "1929-05-01" @default.
• W2057315256 modified "2023-09-24" @default.
• W2057315256 title "Development of Dionaea Muscipula. I. Flower and Seed" @default.
• W2057315256 doi "https://doi.org/10.1086/333957" @default.
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