| Name | Leptogium tremelloides var. caesium (Acharius) Hue | 
| Authorship | (Acharius) Hue | 
| Rank | Variety | 
| Placed in | Leptogium tremelloides (Linnaeus f.) Gray | 
| Citation | 1898 Nouv. Arch. Mus. Hist. Nat. 3 sér. 10: 224 | 
| Holdings | 4 Specimens held in the Harvard University Herbaria identified as Leptogium tremelloides var. caesium (Acharius) Hue | 
| Identification made in | [no date] (4) |