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ascogeneous (adjective) – generative, reproductive, ascus-forming; generally referring to generative hyphae of ascomycetes, i. e., dicaryotic hyphae that are the result plasmogamy. These ascogeneous hyphae typically consist of cells with two genetically different nuclei (heterokaryosis), or, more rarely, consist of cells with genetically identical nuclei (homokaryosis). Ascogeneous hyphae are restricted to as narrow layer within the ascocarp, whereas the majority of a thallus or mycelium consists of somatic, uninucleate, haploid hyphae. The fusion of the two nuclei of the dikaryon is called nucleogamy, generally rapidly followed by the formation of meiospores within a sac-like structure, the ascus.

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