Yes, POLYPORES is a Scrabble word!

Letter values in Scrabble US: P 3, O 1, L 1, Y 4, P 3, O 1, R 1, E 1, S 1.

Is it a valid word?

POLYPORES is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

woody pore fungi; any fungus of the family Polyporaceae or family Boletaceae having the spore-bearing surface within tubes or pores; the fruiting bodies are usually woody at maturity and persistent

Also: pore fungus, pore mushroom.