Formin; polarisome component; nucleates the formation of linear actin filaments, involved in budding and mitotic spindle orientation which require the formation of polarized actin cables; recruited to the division site in a Glc7p/Ref2p dependent manner following release of Bnr1p; spatially focuses Bni1p at mating projection tips, and with Bud6p organizes Bni1p into clusters that nucleate actin assembly during mating projection formation; some functional redundancy with BNR1