Subclass Euascomycetes is a group of fungi that belong to the Ascomycota phylum. Interestingly, this subclass is also known by several other names, depending on the taxonomical classification used. These synonyms include the Pezizomycotina, Discomycetes, Pyrenomycetes, and Loculoascomycetes. Regardless of the name used to describe it, this subclass is characterized by its ascus containing eight ascospores and being produced in a distinctive fruiting body known as an apothecium. Euascomycetes are an essential group of fungi, as they play a crucial role both in decomposing organic matter and as pathogens for various plants and animals. Understanding the different synonyms for this subclass is vital for any student or researcher studying mycology.