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megagametophyte

   Also found in: Dictionary/thesaurus, Medical, Wikipedia, Hutchinson 0.01 sec.
megagametophyte [¦meg·ə·gə′mēd·ə‚fīt]
(botany)
The female gametophyte in plants having two types of spores.
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Seed coat when mature consisting of a red or orange/red or white outer fleshy layer and an inner stony layer; megagametophyte farineacous; embryo with two cotyledons and a coiled suspensor.
Cycads of Colombia by Stevenson, Dennis Wm. / The Botanical Review
In Microcycas, for example, both the microgametophyte and the megagametophyte are apparently primitive, for both are multigametic (up to 100 or more archegonia per megametophtye, though only a few are functional).
Comparative development of the spermatozoids of cycads and Ginkgo ... by Norstog, Knut J.; Gifford, Ernest M.; Stevenson, Dennis Wm. / The Botanical Review
Regeneration in the megagametophyte of Zamia floridana.
Seed coat anatomy of Ceratozamia mexicana (Cycadales) by Sanchez-Tinoco, Maria Ydelia; Engleman, E. Mark / The Botanical Review
 
 
 
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