Sentence:  This is the forest primeval. The murmuring pines and the hemlocks, / Bearded with moss, and in garments green, indistinct in the twilight, / Stand like Druids of eld, with voices sad and prophetic, / Stand like harpers <WSD>hoar</WSD>, with beards that rest on their bosoms. 
Meaning of the word marked with <WSD> tags:  Hoarily bearded.