basidium
Noun
Meaning
A special oblong or pyriform cell, with slender branches, which bears the spores in that division of fungi called Basidiomycetes, of which the common mushroom is an example.
Source: Webster's dictionarySynonyms
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A promycelium is formed that consists of a short hypha (equated to a basidium).
Following meiosis, mitotic divisions can occur in the basidium.
Occasionally, basidiospores are not formed and parts of the "basidia" act as the dispersal agents, e.g. the peculiar mycoparasitic jelly fungus, Tetragoniomyces or the entire "basidium" acts as a "spore", e.g. in some false puffballs ( Scleroderma ).
The spores of puffballs are statismospores rather than ballistospores, meaning they are not actively shot off the basidium.
Often such species form only two spores per basidium, but that too varies.
The diploid basidium begins the cycle again.