ML topologies with branch support obtained through 1000 replicates of SH-like approximate likelihood ratio tests and ultrafast bootstrap annotated SH-aLRT/ufb at the branches for ≥ 85% SH-aLRT and ≥ 95% for ufb support. Collections indicated with * are types; clade names indicated by * include type sequences. Collections in red refer to Mexican material A concatenated ITS, MCM7 and RPB2 sequences of Hebeloma sect. Theobromina, rooted with H. sinapizans (H. sect. Sinapizantia) B ITS sequences of H. sect. Naviculospora, rooted with H. islandicum (H. sect. Naviculospora).