Table 3.

Number of operational taxonomic units assigned to each of nine arbuscular mycorrhizal fungal genera using three clustering similarity thresholds.

	Clustering threshold
Genus	90%	95%	97%
Glomus Tul. & C. Tul. s.l.	277	2392	6229
Diversispora C. Walker & A. Schüßler	20	71	66
Claroideoglomus C. Walker & A. Schüßler	13	1	2
Paraglomus J. B. Morton & D. Redecker	10	19	15
Acaulospora Gerd. & Trappe	6	2	4
Scutellospora C. Walker & F. E. Sanders	4	14	79
Ambispora C. Walker, Vestberg & A. Schüßler	1	2	1
Archaeospora J. B. Morton & D. Redecker	2	3	2
Gigaspora Gerd. & Trappe	1	1	2
Genus could not be assigned	31	19	16