Taeniolella serusiauxii is a species of lichenicolous fungus in the family Mytilinidiaceae.

The type was collected in France, where it was found growing on Dendrographa decolorans.

The specific epithet serusiauxii honours the Belgian lichenologist Emmanuël Sérusiaux.

The fungus has been recorded from Brazil, British Overseas Territories, France, Papua New Guinea, Tanzania, and the United States.

It grows on the lichens Dendrographa decolorans, Tylophoron moderatum, and T. protrudens.