Table 3.

Abundance of fungal OTUs represented in individual counts of rhizosphere soil samples from elevated and ambient [CO₂].

Phylum	Class or Group	Genus	Number of OTUs		P-value
			Elevated	Ambient
Ascomycota	Dothideomycetes		33	26	0.25
	Dothideomycetes et Chaetothyriomycetes insertae sedis		19	1	9.77E-06
	Eurotiomycetes				0.06
		Arachnomyces, Kraurogymnocarpa, and other closely related species	27	3	1.40E-06
		Other	20	30	0.18
	Letiomycetes		2	6	0.28
	Pezizomycetes		16	18	0.86
	Sordariomycetes		25	28	0.88
	Mitosporic Ascomycota				8.23E-04
		Madurella	N.D.	10	0.02
		Other	10	21	0.06
	Other Ascomycota		5	4	0.74
Basiomycota	Agaricomycetes				1.10E-03
		Lepista	N.D.	14	9.78E-05
		Other	13	21	3.33E-03
	Other Basiomycota		8	4	0.25
Glomeromycota			3	2	0.68
Total			181	188	N/A

P-values were calculated based on the Fisher exact test and are outlined in materials and methods. The threshold to determine significance (alpha value) at the phylum, class, and genus level should be adjusted by the Bonferroni correction, also detailed in materials and methods.

N.D. = not detected, N/A = not applicable.