Muscôsus, penult. prod. Adiectiuum. Full of mosse. vt Muscosi fontes. Virg. Nihil muscosius. Cic.Solum muscosum. Prop. A mossie ground.
Lewis and Short: Latin dictionary
muscōsus, a, um, adj. [muscus], full of moss, mossy: prata, Varr. R. R. 1, 9, 5: fontes, Verg. E. 7, 45.—Comp.: nihil alsius, nihil muscosius, Cic. Q. Fr. 3, 1, 2, 5.—Hence, adv.: muscōsē, mossily, Sid. Carm. 2.