| Collybiopsis (J. Schröt.) Earle, 1909 |
| Collybiopsis confluens (Pers.) R.H. Petersen, 2021 |
| Collybiopsis gibbosa (Corner) R.H. Petersen, in Petersen & Hughes, 2021 |
| Collybiopsis peronata (Bolton) R.H. Petersen, 2021 |
| Collybiopsis quercophila (Pouzar) R.H. Petersen, 2021 |
| Collybiopsis subpruinosa (Murrill) R.H. Petersen, 2021 |
| Omphalotaceae Bresinsky, 1985 |
| Pseudomarasmius R.H. Petersen & K.W. Hughes, 2020 |
| Pseudomarasmius nidus-avis (César, Bandala & Montoya) R.H. Petersen, in Petersen & Hughes, 2020 |
| Pusillomyces J.S. Oliveira, 2019 |
| Pusillomyces spinulosus César, Bandala & Montoya, 2020 |