Spore case of basidiomycota asexual reproduction. They differ in that the basidium bears its spores outside while the ascus retains them inside the structure.
This leads to a scenario where each mating type can detect and be detected by the other two, but not itself.
Variations occur, however.
Loose smut of wheat, caused by Ustrlagotrittci"is a floret-infecting smut.
It is differentiated into two parts, the first formed portion and the latter formed portion.
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Basidiomycota have more septate hyphae than Zygomycota, though their septae are perforated, allowing cytoplasm to flow freely between cells.