Perenniporia subacida is a species of poroid fungus in the family Polyporaceae.

It is a plant pathogen that infects Douglas firs.

The fungus was originally described in 1885 by American mycologist Charles Horton Peck.

[1] Marinus Anton Donk transferred it to the genus Perenniporia in 1967.

[2] The four varieties of this fungus originally proposed by Peck, namely Polyporus subacidus var.