| Name | Postia caesia (Schrader) P. Karsten: Fries |
| Authorship | (Schrader) P. Karsten: Fries |
| Rank | Species |
| Placed in | Postia Fries |
| Citation | 1881 Rev. Mycol. (Toulouse) 3(no. 9): 19 |
| Holdings | 1 Specimen held in the Harvard University Herbaria identified as Postia caesia (Schrader) P. Karsten: Fries |
| Identification made in | [no date] (1) |