the two kind of spores are produced within sporangia that are borne on sporopllswhich are arranged spirally along an axis to form lax or compact stobili or cones explain
Heterospory refers to the production of two different sexes and sizes of spores in land plants. Two spores of different sizes i.e. microspores and megaspores are produced in gymnosperms. The spores are produced in the sporangia located on the sporopohylls (leaf bearing sporangia). Sporangia are arranged along the axis of the sporophyll spirally forming a compact strobili or cone.