Scanning electron micrographs of newly isolated representative small-celled strains from filtered ice and from enrichment cultures with most closely related genera: isolates SO3-7w (Arthrobacter), SO3-12 (Arthrobacter), SO3-7r (Sphingomonas), SO3-2 (Microbacterium), UMB 10 (Chryseobacterium), UMB 38 (Sphingomonas), UMB 45 (Frigoribacterium), UMB 49 (Janthinobacter), and UMB 24y (Curtobacterium, also showing the Ascomycota fungus that had been present originally).