The types of Acia sibirica Pil. and A. licentii Pil. have been examined. A. sibirica is a synonym of Protodontia piceicola (Kühn.) Martin, while A. licentii is transferred to the genus Radulodon Ryv. The combination Radulodon licentii (Pil.) Ryv. is proposed.
Ryvarden L. (1976): On the identity of Acia sibirica Pil. and A. licentii Pil. – Česká Mykologie 30(1): 38–40.