Red list of Lycopodiaceae of Luxembourg 2019

The data in this checklist represents the Lycopodiaceae flora of Luxembourg, it was extracted from the publication: Krippel, Y. & J. A. Massard, 2019. Les lycopodes (Lycopodiaceae) au Luxembourg – notes chorologiques et liste rouge. Bulletin de la Société des naturalistes luxembourgeois 121 : 53–69. https://www.snl.lu/publications/bulletin/SNL_2019_121_053_069.pdf Abstract: Within the framework of the reporting scheduled by the implementation of the European Habitat Directive, the monitoring of lycophytes (Lycopodiaceae) had to be carried out in Luxembourg. Since there had been some incoherent information in historic publications and the databases, a detailed analysis of the available literature, databases and herbarium material was carried out in order to clarify the facts. In Luxembourg, historic populations of six different lycophytes are known, i.e. Huperzia selago (L.) Bernh. ex Schrank et Mart., Lycopodiella inundata (L.) Holub, Lycopodium annotinum L., Lycopodium clavatum L., Diphasiastrum complanatum (L.) Holub and Diphasiastrum tristachyum (Pursh) Holub. Unfortunately, some taxa, i.e. H. selago, L. inundata and the representatives of the genus Diphasiastrum are no longer found. The constantly extremely rare Lycopodium annotinum, still present in its known site near Finsterthal, has been monitored since 2010. The monitoring data show a quite fertile and seemingly well-off population despite changes in the biotope after a severe storm with windthrow in 2014. Nevertheless, the conservation status of the interrupted clubmoss remains “Unfavourable – inadequate (U1)”. In contrast, L. clavatum was once a quite common species in Luxembourg, but it had been missing for approximately 20 years before its rediscovery in 2013, when two new sites on the wayside of a forest road were found. Due to the tininess of the two populations of this critically endangered species and their precarious location, the conservation status of the stag’s-horn clubmoss has to be defined as “Unfavourable – bad (U2)”. Based on all the data a revised red list of the lycophytes has been established for Luxembourg. Sixty-six percent of all known Lycopodiaceae must be considered as extinct in the wild and the conservation status of L. annotinum and L. clavatum is not quite encouraging. In order to prevent further losses, a management plan and conservation programme for the rare and highly endangered clubmosses should be set up shortly and implemented on the go. Finally, a historic overview of the uses of the different species has been made.