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Species of the genus Lichenomphalia are mostly restricted to arctic-alpine environments with the exception of Lichenomphalia umbellifera which is also common in northern forests. Although Lichenomphalia species inhabit vast regions in several continents, no information is available on their genetic variation across geographic regions and the underlying population-phylogenetic patterns. We collected...
Recent floristic surveys of the French islands of the southern Indian Ocean (Ile de la Possession, in the Crozet archipelago, Iles Kerguelen and Ile Amsterdam) allow a comparison of the status of the alien vascular plant species in contrasted environmental and historical situations. Four points are established: (1) the current numbers of alien plant species are almost the same on Amsterdam (56) and...
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