La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Biological Flora of the British Isles: Dryopteris carthusiana, D. dilatata and D. expansa
Auteurs :	Kai Ruenk, Auteur ; Martin Zobel, Auteur ; Kristjan Zobel, Auteur
Type de document :	Article
Dans :	Journal of Ecology (100(4) JUL 2012)
Article en page(s) :	1039-1063
Langues:	Anglais
Résumé :	1. This account presents information on all aspects of the biology of Dryopteris carthusiana (Vill.) H. P. Fuchs, D. dilatata (Hoffm.) A. Gray, and D. expansa (C. Presl) Fraser-Jenk. D. expansa is clearly more vulnerable to competition than D. carthusiana and D. dilatata. 5. Dryopteris dilatata and D. carthusiana are both tetraploid, whereas D. expansa is diploid. Natural hybrids among all three species in the British Isles, as well as hybrids of D. carthusiana with D. filix-mas and D. cristata. The hybrid D. carthusiana x D. dilatata = D. x deweveri is the most common. The hybrids D. carthusiana x D. expansa = D. x sarvelae and D. cristata x D. carthusiana = D. x uliginosa are extremely rare and at high risk of extinction. 6. Although not currently threatened, the distribution of all three species may be susceptible to continued habitat loss arising from changes in land use, management for control of Bracken and predicted climate change.

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