Spores: very long, very dark brown under the microscope with large obvious germ-pore and 18 × 10 µm (16-20 × 9-11 µm) in size.
Facial cystidia: flask-shaped and with amorphous contents.
Marginal cystidia: numerous, flask-shaped.
Panaeolus sphinctrinus (Fries) Quélet
Cap: width 15-35 mm. Stem: width 3-6 mm; length 60-95 mm.
Description:
Cap: bell-shaped, hardly expanding, expallent, dark grey to olivaceous black, much paler when dry and zoned when half dry; margin ornamented with a white fringe of veil fragments.
Stem: long, slender, straight, rather rigid but fragile, grey and completely powdered with white.
Gills: adnate, crowded and grey then blackened, mottled throughout except at the white fringed edge.
Flesh: reddish brown.