Adjective
Deviating from the normal, perfect, or mature form; having different forms at different stages of existence, or in different individuals of the same species; -- applied especially to insects in which there is a wide difference of form between the larva and the adult, and to plants having more than one form of flower.
Source: Webster's dictionaryEither the sporophyte or the gametophyte may be reduced (heteromorphic). Source: Internet
However, not all heteromorphic gametophytes come from heterosporous plants. Source: Internet
This type of life cycle is known as a complex heteromorphic life cycle. Source: Internet