Scientific name:Agaricus macrocarpus (F.H. Møller) F.H. Møller 1952 Synonyms:Species Fungorum 06.12.2015: Agaricus arvensis var. macrocarpus (F.H. Møller) E. Ludw. 2007 Psalliota macrocarpa F.H. Møller 1952 Habit of Growth:
Mushroom is not protected
Cap: 10-20 cm across, first hemispherical, later convex to plane, silky, white to yellow white, sometimes with a green tinge, if touched spotting yellow to brown yellow, with concolorous appressed, fibrillose squamules in age, margin is acute, sometimes hung with small veil remnants.
Hymenophore: lamellae are pale pink brown, then increasing purple brown to purple black, narrow, free, edges are smooth and sometimes white floccose.
Spore print: dark purple brown
Spore: elliptic, 6,3-8,1 x 4,4-5,3 μm
Stem: 12-18 x 2-3,5 cm, cylindric, base is with an abrupt to marginate bulb, rigid, hollow, smooth and pale flesh colored above the annulus, cottony longitudinally fbrillose and white below, annulus white, later yellow, membranous, pendent, upper surface is smooth, lower surface is squamose.
Flesh: white, only little yellow if cut, thick, odor is anise like, taste is mild, nutty.
Habitat: solitary to gregarious in hardwood and coniferous forests, grows from summer to fall.
Remarks: similar with Agaricus arvensis, which has never bulbous base.