1) Characterized by heterospory 2) Monogenesis 3) Sporulation 
producing spores of 2 sizes, the larger giving rise to megagametophytes (female), the smaller giving rise to microgametophytes (male). Applied to the ferns and fern allies. cf. homosporous
• (a.) Producing two kinds of spores unlike each other.
Producing spores of both sexes.
<plant biology> Producing separate male and female spores. ... Compare: homosporous. ... (09 Oct 1997) ... 
Producing spores of two sizes, the larger giving rise to female gametophytes, the smaller to male gametophytes.
Producing two different sizes or kinds of spores. These may come from the same or different sporangia, and may produce similar or different gametophytes. Contrast with homosporous, and compare with heterosporangiate.
Producing two different sizes or kinds of spores. These may come from the same or different sporangia, and may produce similar or different gametophytes. Contrast with homosporous, and compare with heterosporangiate.
[adj] - characterized by heterospory
heterosporous, heterospory Producing two different kinds of spores.
adjective characterized by heterospory