The files are associated with the publication "Mycorrhizal fungal mycelium as a global carbon pool" (https://doi.org/10.1016/j.cub.2023.02.027). Files include: - A .xls database of plant photosynthate-carbon allocated to mycorrhizal external mycelium based on diverse methods including isotope labelling, mass balance, biomass, and biogeochemical modelling. Search terms on Scopus were: TITLE-ABS-KEY (mycorrhiza* AND "carbon sequestration") OR (mycorrhiza* AND "13C fatty acids") OR (mycorrhiza* AND 14C) OR (mycorrhiza* AND 13C) OR (mycorrhiza* AND npp) OR (mycorrhiza* AND “carbon stor*”)). - An .R file with code used to test differences between groups, which links to the database. To run the code create a copy of the database in .csv format. - A .rtf file links to the Google Earth Engine script created for the spatial analysis of net primary production (NPP) per mycorrhizal type (see Table 1 in the associated publication https://doi.org/10.1016/j.cub.2023.02.027). Further inquiries can be directed to the lead author Heidi Hawkins (heidi.hawkins@uct.ac.za).

We thank the authors who supplied raw data from published and unpublished studies. HJH was supported by the Friedman Fellowship via Conservation International (grant no. WFF1000896).