megaspore
a large spore produced in a megasporangium
Source: Noland, George B. 1983. General Biology, 11th Edition. St. Louis, MO. C. V. Mosby ...
megaspore -- In plants which are heterosporous, the larger kind of spore is called a megaspore; it usually germinates into a female (egg-producing) gametophyte. Contrast with microspore.
megaspores
which develop in the megasporangium and
which will develop into the female gametophyte generation.
Link to a discussion of the alternation of gametophyte and sporophyte generations ...
megaspores Four haploid cells produced by meiosis in the ovule of a þower. Usually, three of these cells degenerate, with the remaining cell becoming the female gametophyte phase of the plant's life cycle.
megaspore
[Gk. megas, great, large + spora, a sowing]
In plants, a haploid (n) spore that develops into a female gametophyte.
meiosis ...
megaspore
The larger of two types of spores produced by many ferns and seed plants. The megaspore gives rise to a female gametophyte in ferns and in seed plants, and in flowering plants becomes the embryo sac.
Megaspore (macrospore) formation in plants.
Microspore formation in plants.
megaspore Haploid cell produced by meiosis in the ovules of angiosperms; a single megasporocyte produces four megaspores, only one of which remains functional.
Female gametophytes of flowering plants develop within the ovule (megaspore) contained within an ovary at the base of the pistil of the flower.
Better yet, the wind blows the pollen to another conifer of the same species, and a cone (called the ovulate cone) catches the pollen. Again, the pollen and megaspore (receiving haploid cell) are haploid and combine to form a diploid cell.
 See also: Spore, Plant, Gametophyte, Cell, Cells
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