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Journal Article

The Male Gametophyte of Dacrydium

Mary S. Young
Botanical Gazette
Vol. 44, No. 3 (Sep., 1907), pp. 189-196
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Page Count: 9
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1. There are two prothallial cells cut off from the main body of the spore. In Dacrydium Bidwillii usually only the second divides; in D. laxifolium and D. cupressinum both divide. 2. The generative cell divides by an anticlinal wall, one daughter cell functioning as a body cell and the other being sterile. In some cases both produce body cells. 3. The walls of the prothallial cells and the two generative daughter cells disappear. 4. The mature pollen grain contains the body cell and five or six free nuclei, according as the first prothallial cell has or has not divided.

Notes and References

This item contains 7 references.

Literature Cited
  • 1
    COKER, W. C., Notes on the gametophytes and embryo of Podocarpus. BOT. GAZETTE 33:89-107. pis. 5-8. 1902.
  • 2
    THOMPSON, R. B., The megaspore membrane of the gymnosperms. Univ. Toronto Studies, Biol. Series no. 4. 1905.
  • 3
    — Preliminary note on the Araucarineae. ScienceN. S.22:85. 1905.
  • 4
    LOPRIORE, G., Ueber die Vielkormigkeit der Pollenkorner von Araucaria Bidwillii Hook. Vorlaufige Mitteilung. Ber. Deutsch. Bot. Gesells. 23: 335-346. pl. I55. 1905.
  • 5
    JUEL, H. O., Ueber den Pollenschlauch von Cupressus. Flora 93:56-62. pA. 3. 1904.
  • 6
    CHAMBERLAIN, C. J., Review of Lopriore. BOT. GAZETTE 40:391. 1905.
  • 7
    CALDWELL, OTIS W., Microcycas calocoma. BOT. GAZETTE. 44:118-I4I. pis. IO-I3. 1907.