Gram Positive

Bacterial Morphology	Probable Organisms
Cocci in clusters/clumps	Aerococcus spp Micrococcus/Macrococcus spp Pediococcus spp Staphylococcus spp
Cocci in pairs/chains	Anaerobic cocci Enterococcus spp Gemella spp Streptococcus spp
Bacilli (small) non spore forming	Actinomyces spp Arcanobacterium species Actinobaculum species Corynebacterium spp Cutibacterium Erysipelothrix spp Gardnerella vaginalis Listeria spp Other anaerobic bacilli
Bacilli (large) +/- spores	Bacillus spp and related species Clostridium spp and related species Lactobacillus spp and related species
Bacilli branching/ beaded/filamentous	Actinomyces spp and related species Nocardia spp Streptomyces spp