| Name | Leucopaxillus amarus f. typicus R. Singer & A. H. Smith |
| Authorship | Singer & A. H. Smith |
| Rank | Forma |
| Placed in | Leucopaxillus amarus (Albertini & Schweinitz) Kühner |
| Holdings | 1 Specimen held in the Harvard University Herbaria identified as Leucopaxillus amarus f. typicus R. Singer & A. H. Smith |
| Identification made in | 2013 (1) |