Table 1.

The only phylogenetic positions of Olpidium that could not be rejected by either the weighted Shimodaira-Hasegawa (wSH) or the Approximately Unbiased (AU) tests were within the Zygomycota.

Tree	Constraint	ΔlnL	AU1	wSH1
1	Olpidium united with "Zygomycota, unresolved" (Best tree; Figure 2)	0.0	0.896	0.995
2	Olpidium united with Glomeromycota in Zygomycota	19.8	0.208	0.619
3	Olpidium united with Mucoromycotina in Zygomycota	42.3	0.013*	0.087
4	Olpidium united with Dikarya	65.7	0.011*	0.058
5	Olpidium sister to all terrestrial fungi	80.8	0.000**	0.010*
6	Olpidium united with Blastocladiomycota	148.4	0.002**	0.004**
7	Olpidium sister to all other fungi	148.7	0.005**	0.008**
8	Olpidium sister to all terrestrial fungi and Blastocladiomycota	154.6	0.000**	0.000**
9	Olpidium united with Neocallimastigomycota	174.1	0.004**	0.013*
10	Olpidium united with Monoblepharidomycetes	203.6	0.000**	0.000**
11	Olpidium united with "Core chytrid clade"	233.6	0.000**	0.000**

¹AU, Approximately Unbiased; wSH, weighted Shimodaira-Hasegawa test. The constrained tree was significantly worse than the best tree (Figure 2) at P < 0.05* or P < 0.01**.