Ascomycetes have no chlamydospores, whereas Deuteromycetes produce chlamydospores
Ascomycetes only form basidiocarps, whereas Deuteromycetes can also form macroscopic bodies
Ascomycetes are thermophilic, while Deuteromycetes are mesophilic
Ascomycete fungi are known for producing galls, but Deuteromycete fungi do not produce galls
Ascomycetes have hyphae with clamp connections, while Deuteromycetes have more branched hyphae with septate hyphal walls
Ascomycete fungi can be saprobic or parasitic on other fungi or plants, but Deuteromycete fungi do not parasitize other microorganisms
Ascomycetes reproduce sexually by releasing ascospores, which germinate to form mycelium; however, Deuteromycete reproduction is clonal, and microscopic fruiting bodies are formed instead of spores (obligatory anamorphs).