Heterospory occur in:

Explanation

The phenomenon of the development of two types of spores (differing in size, structure, and function) by the same species is known as heterospory. Selaginella is the sole genus of vascular plants in the family Selaginellaceae, the spikemosses or lesser club mosses. All species of Selaginella are heterosporous; that is, they produce spores of two sizes, the larger designated as megaspores and the smaller as microspores. The megaspores develop into female gametophytes and the microspores into male gametophytes.