| Name | Marasmiellus opacus (Berkeley & M. A. Curtis) Singer | 
| Authorship | (Berkeley & M. A. Curtis) Singer | 
| Rank | Species | 
| Placed in | Marasmiellus | 
| GUID | urn:lsid:indexfungorum.org:names:300119 | 
| Citation | 1951 ["1949"] Lilloa 22: 300 | 
| Holdings | 7 Specimens held in the Harvard University Herbaria identified as Marasmiellus opacus (Berkeley & M. A. Curtis) Singer | 
| Identification made in | [no date] (7) | 
