Potassium tellurite agar is selective for the growth of Staphylococci and is somewhat selective for the growth of Corynebacteria. Staphylococci and Corynebacteria reduce the potassium tellurite in the agar, which makes the colonies grow black.

It is a SELECTIVE DIFFERENTIAL media used for the groth of Corynebacterium diphtheria.

TeO3 is the chemical formula of tellurium trioxide.

it can be grown on k tellurite medium.. coryne gives black shining colonies.

There are various species of Corynebacterium.

But the most known one i.e. Corynebacterium diptheriae is cultured in HOYLE's TELLURITE medium.