In Basidiomycetes, the asexual spores are rare or absent. They primarily reproduce sexually through the formation of basidiospores. While other groups like Deuteromycetes and Phycomycetes are known for the production of asexual spores (such as conidia or sporangia), Basidiomycetes generally do not form asexual spores.
Thus, the correct answer is (1) Basidiomycetes.