Acknowledgements
The authors would like to thank Aurora Toennisson for their assistance with sample processing, the Schal lab for feedback on research protocols, Burrack lab members for manuscript suggestions, Keck Center for research funding, the US National Forest Service and the Grandfather Mountain Stewardship Foundation for collection permission, and NSF-IGERT (grant number DGE-1068676) for fellowship support (JEE), and the USDA NIFA OREI program (grant numbers 2018-02859 and 2015-07403) for research support. The authors declare no conflict of interest.