In plant phylogeny it has been concluded that the form of heterospory was established by the appearance of seed habits and the three-dimensional development of pteridophytes.
Heterospory is the best adaptation which help plants for their success to the land.
The major difference is homospory involve the production of single type of spores with same size.
Heterospory is involve in production of two different size and types of spores such as megaspores and microspores.
Homospory is observed in seedless vascular plants and bryophytes while seed plants and some pteridophytes are heterosporous.
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