Wark supérieure's Journal

Since 2017 efforts have been made to establish a most complete cartography of the occurencies of Sphagnum mosses in the area. In former years Sphagnum mosses had been found in the Neiwiss and Haarzebruch blanket bogs near Grosbous, as well as in the forests around Buschrodt. More recently, relatively important areas of up to 200 ares covered with peat mosses have been found in older spruce forests in an area around Grosbous, Dellen and Mertzig. From the  19 Sphagnum species that are known to occur in Luxembourg, 9 species have as far been found  in the Upper Wark area. These are S. palustre, S. auriculatum, S. capillifolium, S. fallax, S. fimbriatum, S.flexuosum, S. inundatum, S. squarrosum, and S. teres.

Other bryological highlights in this area are several occurences of the very seldom Hookeria lucens and Trichocolea tomentella.

The area adjacent to the upper Wark valley is the hotspot in Luxembourg for the small lamiaceae Scutellaria minor (Lesser Skullcap). Initially the species was known to grow in the Grosbous "Haarzebruch" and "Neiwiss" bogs. But recently, since 2017, the species has been found in several other reasonably wet areas as e.g. Grosbous "Säitert", Mertzig "Bill" and "Schwaarzebur" as well as Reimberg "Buchebësch". Other occurencies in the country are only known to exist in Derenbach and in Finsterthal. Historic occurencies in Eltersmuer (Beaufort) and in the Turelbaach valley near Mertzig have not been confirmed until now.
More information: https://www.snl.lu/publications/bulletin/SNL_2018_120_031_048.pdf