Transcription factor that regulates asexual reproduction (PubMed:25208341). Binds the StuA-response elements (StRE) with the consensus sequence 5'-(A/T)CGCG(T/A)N(A/C)-3' at the promoters of target genes (By similarity). Regulates dimorphism, virulence, and the sporulation program (PubMed:20064064). Required for mating, gall induction, and sporogenesis in maize tissue (PubMed:20064064). Regulates expression of the filament-down-regulated gene UM00205 and the teliospore-specific gene ssp1 (PubMed:20064064). Accumulates in the nucleus during teliospore germination (PubMed:25208341). Phosphorylated but is not a target of cAMP signaling (PubMed:25208341). Leads to filamentous growth and abolishes mating and gall induction (PubMed:20064064). In culture, produces abundant thick-walled, highly pigmented cells resembling teliospores which are normally produced only in planta (PubMed:20064064, PubMed:25208341). Belongs to the EFG1/PHD1/stuA family.