[The conifer needle. Structual aspects about healthy and damaged needle leaves]

abies air pollution araucaria ecologia ecologie ecology epiderme epidermis esclerenquima faisceau vasculaire feuille forest dieback haces vasculares harzkanal hojas juniperus konifere leaves marchitez del bosque mesofilo mesophyll morphologie picea pinus plant anatomy plante ligneuse podocarpus sclerenchyma stomata vascular bundles woody plants