How far does Selaginella one of the few living members of lycopodiales (pteridophytes) fall short of seed habit.
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The megaspores and
microspores germinate and give rise to
female and male gametophytes,
respectively. The female gametophytes
in these plants are retained on the
parent sporophytes for variable periods.
The development of the zygotes into
young embryos take place within the
female gametophytes. This event is a
precursor to the seed habit considered
an important step in evolution.
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Explanation:
In the case of Selaginella, the development of the zygote into an embryo takes place within the female gametophyte. This female gametophyte is retained on the parent plant for variable periods. This is considered as a precursor of seed habit because an advanced version of this phenomenon is seen in higher plants; like gymnosperms and angiosperms. But unlike seeds in higher plants; the embryo in Selaginella needs to quickly develop to begin the new generation. However, there could be a temporary suspension of embryo growth; which is similar to seed dormancy in higher plants.
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