Number of fungal samples in which the different MOTUs were detected using sequencing of the ITS region (ITS1, 5.8S, ITS2) of ribosomal DNA.

aPCR was performed directly on the fungal patch using fungal universal primers ITS1f and ITS4, and thus only one species per sample can be detected.bspecies were detected using either universal primers, molecular cloning of PCR product or species-specific primers, so that several species per sample can be detected.ceither no amplification, or the sequence was not readable.dsequences that do not belong to Chaetothyriales (likely contaminants or non-symbiotic competitors).