This kind of spore is specific to fungi classified as ascomycetes (Ascomycota). Sexual reproduction in basidiomycetes is similar to that of the ascomycetes. Most lichen fungi belong to Ascomycetes ("ascolichens"). It also has a symbiotic relationship with fungi, specifically ascomycetes and basidiomycetes. Most phytopathogenic fungi belong to the Ascomycetes and the Basidiomycetes. Most efficient wood degraders are saprotrophic ascomycetes and basidiomycetes. There are six endemic ascomycetes, three of which are lichenized. A pileus is characteristic of agarics, boletes, some polypores, tooth fungi, and some ascomycetes. They were divided into four classes&colon; Phycomycetes, Ascomycetes, Basidiomycetes, and Deuteromycetes. Coccidioides is a genus of dimorphic ascomycetes in the family Onygenaceae. Examples of dikaryon can be found in ascomycetes and basidiomycetes. The length of the genome is 39.7 Mb, that is similar to other filamentous ascomycetes. The genome contains 21 chromosomes, that is the highest number reported among ascomycetes. Its members are commonly known as the sac fungi or ascomycetes. Several species of ascomycetes are biological model organisms in laboratory research.