Rickenella fibula (Bull.) Raithelh. 1973
The precise placement of this fungus is unsettled. Index Fungorum has it in the Cantharellales order. Mycobank puts it in the Rickenellaceae family of the Hymenochaetalaes and Wikipedia has it in the Repetobasidiaceae family of the Hymenochaetales.
Rickenella fibula