| Name | Tricholoma portentosum (Fries) Quélet: Fries |
| Authorship | (Fries) Quélet: Fries |
| Rank | Species |
| Placed in | Tricholoma (Fries) Staude |
| Citation | 1873 Mém. Soc. Émul. Montbéliard 5: 338 |
| Holdings | 14 Specimens held in the Harvard University Herbaria identified as Tricholoma portentosum (Fries) Quélet: Fries |
| Identification made in | [no date] (14) |