positive
Aerococcus viridians Aeromonas caviae Aeromonas hydrophila Corynebacterium xerosis ( Positive sporeforming? ) Corynebacterium pseudodipthericium Escherichia coli ( Non sporeforming Lactobacillus acidophilus Micrococcus roseus ( Nonsporeforming )? Proteus mirabilis ( Non sporeforming )? Proteus vulgaris ( Non sporeforming )? Providencia alcalifaciens Rhodococcus rhodochrous Serratia marcescnes Sporosarcina ureae Staphylococcus aereus
Endosposres are intracellular resting cells. With a few exceptions endospore formation is restricted to some large gram positive bacilli. Among cocci and spirila endospores are formed only in few species e.g. Sarcina lutea, S. ureae, Dusulfovibrio desulfuricans. Gramd negative do not form spores or endospores.