Some of the cells grow into nutritive cells that supply nutrition for the microspores that form by meiotic division from the sporogenous cells.
32.
After the formation of the four microspores, which are contained by callose walls, the development of the pollen grain walls begins.
33.
Inside the sporocarp, the modified leaflets bear several "'microsporangia, each of which will produce many small male microspores.
34.
"' Microspores "'are land plant spores that develop into male gametophytes, whereas megaspores develop into female gametophytes.
35.
During meiosis, a diploid microspore mother cell undergoes two successive meiotic divisions to produce 4 haploid cells ( microspores or male gametes ).
36.
During meiosis, a diploid microspore mother cell undergoes two successive meiotic divisions to produce 4 haploid cells ( microspores or male gametes ).
37.
The " in vitro " methods include gynogenesis ( ovary and flower culture ) and androgenesis ( anther and microspore culture ).
38.
Microspores, which will divide to become pollen grains, are the " male " cells and are borne in the stamens ( or microsporophylls ).
39.
It is a dioecious species with male specimens that have microspores dispersed from cones of ovoid shaped terminals, 120 mm long and 80 mm wide.
40.
Within the stamen the microsporangium forms grains of "'pollen "', surrounded by the protective microspore, which forms the male gametophyte.
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