Table S3.
Morphometric parameters of the irregular grains in the Italian Quercus species
| Species | Provenance | Irregular grains | |
| Mean width-to- length ratio | Dimensional range of the main axis, μm | ||
| Q. cerris L. | Florence, Botanic Garden | 0.60 | 8–24 |
| Q. virgiliana (Ten.) Ten. | San Chirico Raparo, Potenza (FI) | 0.66 | 10–28 |
| Q. frainetto Ten. | San Biagio in Cisterna, Latina (FI) | 0.76 | 8–25 |
| Q. macrolepis Kotschy | Tricase, Lecce (FI) | 0.73 | 8–25 |
| Q. petraea Liebl. | Florence, Botanic Garden | 0.73 | 6–20 |
| Q. pubescens Willd. | San Gimignano, Siena | 0.78 | 8–23 |
| Q. robur L. | Florence, Botanic Garden | 0.50 | 8–20 |
| Q. trojana Webb | Lecce (FI) | 0.73 | 8–28 |
| Q. ilex L. | Grosseto | 0.67 | 7–20 |
| Q. suber L. | Florence, Botanic Garden | 0.80 | 8–18 |
| Irregular grains of the Paglicci grinding stone | 0.61 | 25–30 | |
FI, exsiccata of the Herbarium Centrale Italicum.