Supplement 1. The raw data on pollen morphology and climate variables of the collection sites used in the analysis.

File List data.txt -- (MD5: a82e69f2e3cab98107c9ae2557ce613f) Description The data.txt is a tab-separated file. It contains the raw data on pollen morphology (polar axis, equatorial axis, surface area, and volume) and climate variables (Temperature, PET, and altitude) of the collection sites. Column definitions are given in the file. Missing values are represented as “-9999”. Checksum values are: Column 3 (Collection site – Latitude): SUM = 3786.63; 16 missing values (rows with data: 74) Column 4 (Collection site – Longitude): SUM = 1410.62; 16 missing values (rows with data: 74) Column 5 (Altitude provided by collector [m]): SUM = 16531.00; 74 missing values (rows with data: 16) Column 6 (Altitude SRTM 250x250m [m]): SUM = 16931.00; 16 missing values (rows with data: 74) Column 7 (Temperature May [deg.C]): SUM = 429.20; 56 missing values (rows with data: 34) Column 8 (Temperature June [deg.C]): SUM = 989.70; 29 missing values (rows with data: 61) Column 9 (Temperature July [deg.C]): SUM = 635.40; 55 missing values (rows with data: 35) Column 10 (Mean temperature in flowering period [deg.C]): SUM = 9867.12; 16 missing values (rows with data: 74) Column 11 (PET May [mm]): SUM = 3766.00; 56 missing values (rows with data: 34) Column 12 (PET June [mm]): SUM = 7920.00; 29 missing values (rows with data: 61) Column 13 (PET July [mm]): SUM = 4826.00; 55 missing values (rows with data: 35) Column 14 (Mean PET in flowering period [mm]): SUM = 9354.58; 16 missing values (rows with data: 74) Column 15 (Polar axis [um]): SUM = 2862.63; 0 missing values (rows with data: 90) Column 16 (Equatorial axis [um]): SUM = 2501.41; 0 missing values (rows with data: 90) Column 17 (Volume of an ellipsoid for a given P and E [um^3]): SUM = 1284905.60; 0 missing values (rows with data: 90) Column 18 (Surface of an elipsoid for a given P and E [um^2]): SUM = 247975.40; 0 missing values (rows with data: 90)