mythicus
From LSJ
mȳthĭcus: a, um, adj., = μυθικός,
I of or belonging to fables or myths, fabulous, mythic, mythical (post-Aug.).
I Adj., a false reading for mysticus, Plin. 7, 53, 54, § 184.—
II Subst.: mȳthĭcus, i, m., a writer of fables or myths, a mythographer, Macr. S. 1, 8.