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Ascomycota

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Ascomycota, the sac fungi, form haploid ascospores inside a sac-shaped ascus, and make up the majority of described fungal species.

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Baker's yeast, truffles, and morels are all Ascomycota, alongside Penicillium, the mold genus that yields the antibiotic penicillin.

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Many Ascomycota reproduce asexually far more often than sexually— the defining ascus appears only during their rare sexual phase.