Mycena galericulata—usually 2-spored?

Mycena galericulata (Scop. ex Fr.) S. F. Gray is a common agaric, widely distributed in Europe and readily recognized. Whether this also applies to extra-European areas is here left out of consideration, while the actual investigation is concerned only with the situation in the Netherlands. As far as I have been able to check, the general opinion in Europe has been and still is that M. galericulata occurs predominantly with 2-spored basidia. A few references may be cited to substantiate this statement; some care had to be taken in consulting those authors who regarded M. galericulata and M. rugosa Fr. (now considered to represent one and the same species) as distinct.