| Name | Pireella ludoviciae (Müller Halle) Grout |
| Authorship | (Müller Halle) Grout |
| Rank | Species |
| Placed in | Pireella |
| Citation | 1934 Moss Fl. N. Amer. 3: 216, 56. |
| Holdings | 1 Specimen held in the Harvard University Herbaria identified as Pireella ludoviciae (Müller Halle) Grout |
| Identification made in | [no date] (1) |
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