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Journal Article

The Development of the Embryo of Encephalartos

W. T. Saxton
Botanical Gazette
Vol. 49, No. 1 (Jan., 1910), pp. 13-18
Stable URL: http://www.jstor.org/stable/2466559
Page Count: 7
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Abstract

1. The suspensor is developed by the division and elongation of a group of cells at the proximal end of the embryo. 2. This group of cells forms later the root meristem. 3. Branching of the suspensor has been observed once, resulting in the formation of two approximately equal embryos. 4. The cotyledons are initiated by the more rapid growth of two groups of cells of the apical meristem. 5. The canals appear before the differentiation of plumular leaves, and probably contain both tannin and mucilage, being formed lysigenously. 6. A very intimate connection is established between the epidermal cells of fusing cotyledons. 7. The suspensor is morphologically a root cap. 8. The embryogeny of Encephalartos is very similar to that of Gingko.

Notes and References

This item contains 5 references.

[Footnotes]
  • 2
    WARMING, E., Undersogelser of Betragtninger over Cycadeerne. i877.
  • 3
    TREUB, M., Recherches sur les Cycadees. 3. Embryog6nie du Cycas circinalis. Ann. Jard. Bot. Buit. 4:1-I . pIs. I-3. 1884.
  • 4
    IKENO, S., Untersuchungen uber die Entwickelung der Geschlechtsorgane und der Vorgang der Befruchtung bei Cycas revolutsa. Jahrb. Wiss. Bot. 32:557-602. pIs. 8-io. 1898.
  • 5
    COULTER, J. M., AND CHAMBERLAIN, C. J., The embryogeny of Zamia. BOT. GAZETTE35: 184-I94. pIs. 6-8. I903.
  • 7
    LYON, H. L., The embryogeny of Ginkgo. Minn. Bot. Studies 3:275-290. pIs. 29-43. 1904.