The fungi that produce a fruiting body containing sac-like structures with spores lined up in a row belong to the phylum Ascomycota. Here's why:
1. **Fruiting Body:** Ascomycota fungi are known for producing a specific type of fruiting body called an ascocarp.
2. **Sac-like Structures:** Within the ascocarp of Ascomycota fungi, you can find sac-like structures called asci (singular: ascus) where the spores are produced and stored. These asci are lined up in a row within the fruiting body.
3. **Examples:** Examples of fungi belonging to the phylum Ascomycota include morels, truffles, and yeasts. These organisms exhibit the characteristic sac-like structures containing spores lined up in a row within their ascocarps.
In summary, if you encounter fungi that match the description of producing a fruiting body with sac-like structures containing spores lined up in a row, you can confidently place them in the phylum Ascomycota.