Biatoridium is a genus of lichen-forming fungi of uncertain familial, ordinal, and class placement in the Ascomycota.

The species of this genus are found in Europe and Northern America.

Species:

• Biatoridium delitescens (Arnold) Hafellner
• Biatoridium lasiothecium C.A.Morse & Lendemer
• Biatoridium monasteriense J.Lahm ex Körb.
• Biatoridium neozelandicum Müll.Arg.

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