Acts as actin nucleation factor that directs the formation of actin cables and polarized growth in pollen tubes. A number of isoforms are produced. According to EST sequences. Belongs to the formin-like family. Class-I subfamily. Was originally thought to correspond to two different genes At4g15190 and At4g15200. Was originally thought to correspond to two different genes At4g15190 and At4g15200. Was originally thought to correspond to two different genes At4g15190 and At4g15200. Was originally thought to correspond to two different genes At4g15190 and At4g15200.