| Name | Hygrophorus immutabilis Peck |
| Authorship | Peck |
| Rank | Species |
| Placed in | Hygrophorus |
| Citation | 1898 Rep. (Annual) Regents Univ. State New York New York State Mus. 51: 292 |
| Holdings | 2 Specimens held in the Harvard University Herbaria identified as Hygrophorus immutabilis Peck |
| Identification made in | [no date] (2) |
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