How far does Selaginella one of the living members of Lycopodiales (pteridophytes ) fall short of seed habit?

Explanation

Seed habit The defferentiation of spores into microspores and megapores and their dependence on the parent sporophte for the nutrition, are the certain fetures in the life cycle of Selaginella, which hav been considered as the essential pre-requite for formation of seed, the characteristic of spermatophyte.
The evolution of heteropory and seed habits in Selaginell is evident by the folllowing characters
(i) Reduction to a single functional megaspore per sporangium
(ii) Retention and germination of megaspore within megasporangium
(iii) Development of protective layer and nutritive tissue called tapetum is present.
(iv) Delvelopment of embryosac wiht in the sporangium.
(v) Modification of distal end of mega sporangium to compture pollen grain
(vi) Pollination and siphonogamy
(vii) Temporary suspension of growth of embryo (dormancy period)