Here's why:

* Basidiomycetes are known for their sexual reproduction: Their defining characteristic is the production of basidiospores, which are formed through meiosis on specialized structures called basidia.

* Asexual reproduction in fungi: While many fungal groups utilize asexual spores (like conidia) for rapid propagation, basidiomycetes have largely evolved to rely on sexual reproduction.

* Exceptions: Some basidiomycetes might exhibit limited forms of asexual reproduction, but this is not their primary mode of propagation.

So, while some fungi do utilize asexual spores, basidiomycetes are primarily known for their sexual reproduction through basidiospores.