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Sex organs are absent in Basidiomycetes. Plasmogamy occurs through the fusion of two vegetative or somatic cells belonging to different strains or genotypes, producing a dikaryotic structure.
Ref: NCERT Class 11 Biology Chapter 2: Biological Classification Fungi - Deuteromycetes and Economic Importance
In Ascomycetes and Basidiomycetes, plasmogamy may be followed by an intervening dikaryotic stage before karyogamy. Each cell then contains two haploid nuclei, represented as n + n, and the phase is called the dikaryophase.
Ref: NCERT Class 11 Biology Chapter 2: Biological Classification Bacteria - Structure and Economic Importance
In typical fungal sexual cycle, plasmogamy brings haploid nuclei of compatible mating types into shared cytoplasm creating heterokaryotic or dikaryotic mycelium after hyphal anastomosis. Immediate next phase without nuclear fusion is proliferation of dikaryotic cells via synchronized division, often aided by clamp connections in basidiomycetes ensuring both nuclei segregate. This dikaryotic stage persists extended, with two nuclei dividing conjugately for long periods. Diploid stage only transient after karyogamy inside zygote, ascus or basidium before meiosis. Thus stage directly following plasmogamy is dikaryotic, not diploid, haploid or meiotic.
Ref: Campbell Biology 12th ed., Chapter 31: Fungal Sexual Reproduction Sequence Dikaryotic Stage; NCERT Class 11 Plasmogamy
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