Histograms of soil bacteria richness.

<p>571–578 represent the control (ck), Mn, Zn, Fe, Zn∙Fe, Fe∙Mn, Zn∙Mn and Zn∙Fe∙Mn groups, respectively, during the primordial differentiation stage. 579–586 represent the same groups of above during the ascocarp growth stage. The length of columns indicate the proportions of bacteria at the phylum level.</p>