Gram+RodCat-

Catalase Negative Gram Positive Rods
Clostridium sprogenes and Lactobacillus acidophilus are the two organisms that fit these criteria.

Tests
Required: Anoxic environment, PR Glucose, Lactose, and Sucrose

Helpful: Hydrogen Sulfide production

Key
Lactobacillus acidophilus: Strong positive on PR Glucose, Lactose, and Sucrose, no Hydrogen Sulfide production, can survive oxygen.

Clostridium sprogenes: Negative to weak positive on PR Glucose, Lactose, and Sucrose, can produce H2S, will not grow in the presence of Oxygen