Required to form a bipolar spindle; the actin ring and septum. Functions upstream of the whole septum formation pathway; including actin ring formation (regulated by late septation genes) and septal material deposition (regulated by early septation genes). Behaves as a "septum-promoting factor"; and could also be involved in inducing other late events of cell division (PubMed:12615979; PubMed:12815070; PubMed:7744248). Together with moa1; acts as a regulator of kinetochore function during meiosis I: required both for mono-orientation of kinetochores on sister chromosomes and protection of centromeric cohesin from separase- mediated cleavage (PubMed:25533956). {ECO:0000269|PubMed:12615979; ECO:0000269|PubMed:12815070; ECO:0000269|PubMed:25533956; ECO:0000269|PubMed:7744248}.