It involves the union of two protoplast bringing two haploid nuclei close together in the same cell.

Type 3 is when haploid nuclei continue to divide mitotically and then some associate into groups and some do not.

This results in diploid and haploid nuclei being found in the germ sporangium.

Also, in the vegetative state they have diploid nuclei, whereas fungi have haploid nuclei.

Once a diploid nucleus has formed by fusion of two haploid nuclei from different parents, the parental genes can potentially recombine.

For example, a fungal dikaryon with two haploid nuclei is distinguished from the diploid in which the chromosomes share a nucleus and can be shuffled together.

Hyphae growing in the plant are dikaryotic; they possess two haploid nuclei per hyphal compartment.

Resulting haploid nuclei migrate into elongated single cells.

Similar to mosses and algae, fungi typically have haploid nuclei.

Basidiospores typically each contain one haploid nucleus that is the product of meiosis, and they are produced by specialized fungal cells called basidia.