The article studies the reception of medieval German mysticism in the Compilatio mystica, a mosaic treatise from the end of the 14th century, in backing up the reasons of its attachment to so-called “Rhineland” mysticism, represented by Meister Eckhart and his followers. The study begins by considering how this compilation was regarded formerly through a few marginal notes in some manuscripts, which help to better understand its reception. This is followed by a schematic overview of the rich and diverse contents of this “mosaic”, focusing on its sys-thematic coherence and on its characteristic language and style, and then on the mystical authors included in the compilation. The weight of the auctoritates and of scholastic erudition in this Lehrsystem in Middle High German is also taken into account.