a spore that is borne by a basidium.
Historical Examples

D, Passage of a nucleus through the sterigma into the basidiospore.
Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 3 Various

one of the spores, usually four in number, produced in a basidium
A sexually produced fungal spore borne on a basidium in the fungi known as basidiomycetes. Basidiospores are produced by the union of the nuclei at the tip of a binucleated segment of a hypha. The resulting zygote then divides by meiosis into four haploid nuclei, each of which migrates to the very tip to be released as a basidiospore. A typical mushroom produces billions of basidiospores.


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