Is an invasive alien tree able to sustain a similar lichen diversity as the native forest? The case of the sweet chestnut (Castanea sativa Mill.) and the laurel forest in Macaronesia

•We studied the effect of the invasive alien tree Castanea sativa on epiphytic lichens.•Native forest plays a key role in maintaining biodiversity.•Castanea sativa forest does not regain the lichen diversity of the natural forest.•The lichen diversity of the native forest has been altered after the invasion of the chestnut trees.