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Frequency of triploidy and stomata length of triploid and diploid Q. robur trees
| Triploids | Diploids | Source | ||
|---|---|---|---|---|
| No. of individuals | Frequency | Mean stomata length (µm) | Stomata length (µm) | |
| 3 | 0·41 % | N/A | N/A | Johnsson (1946) |
| 2 | 0·57 % | 26·3 | Mean 20·2 | Burda and Shchepotiev (1973), Butorina (1993) |
| 1 | 0·25 % | 24·5 | 18·2–20·1 | Naujoks et al. (1995) |
| 5 | N/A | 28·5 | Mean 22·4–26·4 | Lefort et al. (1998, 2000), Lefort and Douglas (1999) |
