Extended genetic resources of Dactylis glomerata subsp. izcoi in Galicia (northwest Spain)

Dactylis glomerata subsp. izcoi, endemic to Galicia (NW Spain), includes diploid and tetraploid cytotypes. The present paper results from ongoing research on the distribution of Dactylis in Galicia. Tetraploids dominate all kind of habitats, but diploids do occur in restricted areas. After intensive exploration carried out by the Misión Biológica de Galicia, dealing with diploid populations of subspecies izcoi, 13 new diploid localities were recently detected along the ridge called Macizo Galaico Duriense three on the west side of the ridge and the remainder on the east, persisting in ancient habitats in the following communities: Quercetea robori-petrea, Erico-Ulicetalia, Ericion australis and Ulicion nanae. Two diploid populations have been detected for the first time in Coruña Province. However, no diploids were found on the west side (near the coast) of Coruña and Pontevedra Provinces, probably due to Atlantic influence.