Tricholoma myomyces
Tricholoma myomyces is a mushroom of the agaric genus "Tricholoma", usually considered to be a synonym of "Tricholoma terreum". The species was first described scientifically by Christian Hendrik Persoon in 1794 as "Agaricus myomyces", and later transferred to the genus "Tricholoma" by Danish mycologist Jakob Emanuel Lange in 1933. It is found in Europe and northern North America. Almost all modern sources consider "T. myomyces" to be a synonym of "T. terreum", but there are some exceptions. Bon mentions that "T. myomyces" has been defined for lowland mushrooms with white gills and a fleecy cap. Courtecuisse separates it  on a similar basis: the cap surface is felty and the gills are whitish and more crowded. Moser distinguished "T. myomyces" on the basis that the gills should go yellow. The gray cap is 2–5 cm wide. The whitish stalk is 2–5 cm long and .5–1 cm wide. It has white spores. One similar species is "Tricholoma moseri".