Mucoromycotina 'Fine Root Endophytes' (MFRE), referred to previously as Glomus tenue (Greenall) or more recently Planticonsortium tenue (Walker et al., 2018), are a globally distributed group of soil fungi (Orchard et al., 2017a) that form endosymbioses with plants from across most of the land plant phylogeny (Rimington et al., 2019; Hoysted et al., 2018; 2019). Despite much progress having been made in characterising plant-MFRE symbioses in the last decade, significant challenges remain.