Name requested: Rigidoporus nigrescensMycotaxon 53: 445. Persoonia 4 (3): 341.
Homotypic synonym: Poria nigrescensMycologia 13 (1): 36. 13 (2): 87, 88. 14 (1): 7, 8, 9, 9, 10, 10, 11. 34 (2): 233. 48 (1): 114. 53 (5): 492. 56 (4): 606, 625. 59 (2): 380. 61 (4): 822. Mycotaxon 7 (2): 350. 33: 317. 75: 499. Persoonia 4 (3): 341.
Heterotypic synonym: Poria crocataMycotaxon 77: 98.
Heterotypic synonym: Rigidoporus crocatusMycotaxon 33: 317. 52 (1): 28, 37, 39. 75: 499. 77: 98. 78: 401. 83: 213.