Name requested: Meruliopsis spissaMycologia 65 (1): 197.
Homotypic synonym: Physisporinus spissusMycologia 34 (5): 595. 46 (1): 121.
Homotypic synonym: Polyporus spissusMycologia 13 (2): 96. 15 (5): 223. Mycotaxon 22 (2): 364.
Homotypic synonym: Poria spissaMycologia 13 (2): 94, 96, 98. 15 (5): 223. 33 (5): 576. 53 (5): 492. 59 (2): 380. 59 (5): 916. 61 (4): 822. Mycotaxon 18 (2): 521.
Homotypic synonym: Ceriporia spissaMycotaxon 17: 275, 276, 278, 280, 290. 22 (2): 364. 57: 50. 71: 343. 78: 398. 86: 339, 341, 346.
Heterotypic synonym: Polyporus crociporusMycotaxon 20 (2): 337.
Heterotypic synonym: Poria crociporaMycologia 13 (2): 96.