Appendix S1. Nitrogen fixation potential.Figure S1. Nitrogen fixation rates of Peltigera aphthosa, Hylocomium splendens and Nephroma arcticum.As a service to our authors and readers, this journal provides supporting information supplied by the authors. Such materials may be re-organized for online delivery, but are not copy-edited or typeset. Technical support issues arising from supporting information (other than missing files) should be addressed to the authors.

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