Over the hills, but how far away? estimates of mushroom geographic range extents

Aim: Geographic distributions of mushroom species remain poorly understood despite their importance for advancing our understanding of the habitat requirements, species interactions and ecosystem functions of this key group of organisms. Here, we estimate geographic range extents (maximum within-species geographic distance) of genetically defined operational taxonomic units (OTUs).
Location: World-wide, with emphasis on the American Pacific Northwest
Taxa: Amanita, Agaricus, Cortinarius, Galerina, Hebeloma, Hydnum, Hygrocybe, Hygrophorus, Inocybe, Lepiota, Pholiota, and Russula+Lactarius; other genera in Agaricomycotina
Method: We used publicly available OTUs from ribosomal internal transcribed spacer (ITS) sequences (n=15,373) from 12 mushroom genera with worldwide distributions. For each of 2,324 ~species-level OTUs, we estimated the maximum within-species range extent based on sample locality records. In parallel, we estimated range extents for species in four tree genera. Contras...