A key to the species of Asproinocybe

1 Cheilocystidia absent..........................................................................................................................................................................2

1* Cheilocystidia present ........................................................................................................................................................................4

2 Pleurocystidia present (25–30 × 5–6 μm); basidia 20–24 × 6–8 μm ................................................................................ A. lactifera

2* Pleurocystidia absent .........................................................................................................................................................................3

3 Stipe pale greyish to pale violet on the surface; basidiospores 6.2–8.0 × 4.2–6 μm............................................. A. brunneolilacina

3* Stipe purple, brown-spotted on the surface; basidiospores 5.5–6.9 × 3.5–5.2 μm.................................................... A. lyophylloides

4 Basidiospores length ≥ 7 μm ..............................................................................................................................................................5

4* Basidiospores length <7 μm ..............................................................................................................................................................6

5 Cheilocystidia 30–40 × 8–10 μm; pleurocystidia 29–44 × 8–10 μm ................................................................................. A. sinensis

5* Cheilocystidia 41–57×8–12 μm; pleurocystidia 42–79 × 10–18.5 μm ...................................................................... A. nodulospora

6 Basidia width ≥ 8 μm..........................................................................................................................................................................7

6* Basidia width <8 μm .........................................................................................................................................................................8

7 Stipe pale grey on the surface; pileus medium grey too dark grey ............................................................................. A. hongyaniae

7* Stipe pale violet grey on the surface; pileus greyish violet................................................................................................. A. daleyae

8 Basidia length <26 μm; basidiospores 6.0–8.0 × 4.5–6.0 μm. .................................................................................... A. russuloides

8* Basidia length ≥ 26 μm ......................................................................................................................................................................9

9 Pileus 70 mm in diam., dark purplish on the surface ......................................................................................................... A. superba

9* Pileus 5–45 mm in diam., brownish orange to mustard brown on the surface...................................................................... A. fucata