“…Among these, rhapidosomes are in dispute (e.g., 8,9,14,20,22). Tubules, narrower than the microtubules of eucarvotes, have been observed in the cytoplasm of various species of mvxobacteria and of the blue-green bacterium Nostoc (1,18,25,26). Recentlv, cup-shaped subunits (goblets) have been observed on envelopes of Flexibacter polvmnorphuls (23,24).…”