Neohygrocybe, Herink, 1958

Wang, Chao-Qun, Zhang, Ming & Li, Tai-Hui, 2018, Neohygrocybe griseonigra (Hygrophoraceae, Agaricales), a new species from subtropical China, Phytotaxa 350 (1), pp. 64-70 : 69

Key to the known species of Neohygrocybe worldwide

1. Flesh not staining red and/or blackish brown when bruised; odor strongly nitrous............................................................. N. nitrata

- Flesh staining red and/or blackish brown when bruised; odor mild to only slightly nitrous.............................................................2

2. Pileus reddish brown to orange-brown, smooth (often cracking at age)............................................................................. N. ingrata

- Pileus brownish gray, brown to grayish brown, fibrillose or fibrillose-squamulose ........................................................................ 3

3. Lamellae bruise red............................................................................................................................................................................4

- Lamallae bruise red then blackish......................................................................................................................................................5

4. Odor fruity; spores globose to subglobose (5–6 × 5–5.7 μm); from North America ........................................................ N. subovina

- Lacking a fruity odor; spores broadly ovoid to ellipsoidal, rarely subglobose 6–7.5 × 4.4–5.4 μm; from Australia.......................... ...................................................................................................................................................................................... N. lawsonensis

5. Basidiomata usually much larger (up to 90 mm in pileus diam); lamellae gray with some green tints, slightly blackening; occurring in Europe ................................................................................................................................................................................ N. ovina

- Basidiomata smaller (up to 35 mm in pileus diam); lamellae whitish to grayish white, obviously blackening; occurring in East Asia............................................................................................................................................................................... N. griseonigra