O-methyltransferase of unknown substrate specificity. Not active on resorcinol, orcinol, guaiacol, eugenol, ferulic acid, p-coumaric acid, catechol, caffeic acid or monomethyl ethers of resorcinol or orcinol. Homodimer. Expressed predominantly in root hairs. Belongs to the class I-like SAM-binding methyltransferase superfamily. Cation-independent O-methyltransferase family. COMT subfamily.