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Glomus aggregatum is an arbuscular mycorrhizal fungal species belonging to the phylum glomeromycota1. Like other species in its genus, G. aggregatum functions ecologically by forming mutualistic symbiotic relationships with the roots of plant species. These symbioses are extremely ecologically significant, affecting over 90% of plant roots7,10 on earth. It was first described as Glomus aggregatum by N.C. Schenck and George S. Smith in 19822 after being found in the roots of citrus trees in a citrus grove near Haine's City, Florida. However, R.E. Koske3 (1985) emended the description of the species to include Rhizophagites Butleri, discovered and described in 1939 by Ediwin John Butler4 but named by C.O. Rosenthal5 in 1943. G. aggregatum is nested within the kingdom fungi, the phylum glomeromycota, the class glomerales, the order glomeraceae, and the genus glomus. Glomus is the largest genus within glomeromycota1. In 2001 it was analyzed and reorganized by Schwarzott, Walker, and Schußler1, who discovered that the genus was not monophyletic. As a result, many members of glomus were migrated to a new family separated from glomaceae and the creation of three other genera was prompted. G. aggregatum, however, was not placed elsewhere in this analysis nor any since. Schußler’s most recent (2010)16 phylogeny places G. Aggregatum as sharing most recent common ancestor with a polytomy formed by G. luteum, G. claroideum, G. lamellosum, and G. etunicatum within the family Glomeraceae.