adjective Botany.
- having more than one kind of spore.
adjective
- (of seed plants and some ferns and club mosses) producing megaspores and microsporesCompare homosporous
- Producing two types of spores differing in size and sex, the male microspore and the female megaspore, which develop into separate male and female gametophytes. All seed-bearing plants, as well as some ferns and other seedless plants, are heterosporous. Compare homosporous.