In Stemonitis the capillitium arises from a stout, central columella and forms a three dimensional network to support the spore mass.    There are no 'free' ends  as there are in Comatricha and the capillitium forms a surface net.   The capillitial network supports the spore mass and the spores are released a few at a time for more effective spacial and temporal distribution.   You can see a few of the tiny spherical spores still trapped in the capillitium.