Stemonitis Vlasenko, Moreno & Vlasenko, 2023

Key to the species of the genus Stemonitis

1. Columella ending with expansions....................................................................................................................................................2

- Columella ending without expansions...............................................................................................................................................6

2. Spores reticulate............................................................................................................................................... S. amphorocolumella

- Spores not reticulate..........................................................................................................................................................................3

3. Columella ending with membranous cup-like expansions........................................................................................... S. flavogenita

- Columella ending with widened expansion at the apex....................................................................................................................4

4. Capillitium without free ends.................................................................................................................................... S. sichuanensis

- Capillitium with free ends.................................................................................................................................................................5

5. Spores 9–11 µm diam., spinulose......................................................................................................................... S. capillitionodosa

- Spores, 7–8 µm diam., large warts and small warts......................................................................................... S. pseudoflavogenita

6. Spores reticulate................................................................................................................................................................................7

- Spores not reticulate........................................................................................................................................................................11

7. Reticulum with large or medium meshes on spores..........................................................................................................................8

- Reticulum with small meshes on spores............................................................................................................................................9

8. Reticulum black, with 2–4 meshes across the spore. Spores dark brown in mass, red-brown in transmitted light, 8–9 µm diam......................................................................................................................................................................................... S. inconspicua

- Reticulum with 6 meshes across the spore. Spores bright lilac-brown in mass, pale lilac-brown, light reddish or pinkish brown in transmitted light, 6–8 µm diam................................................................................................................................... S. virginiensis

9. Reticulum with 8–11 meshes across the spore. Spores reddish-brown to dark brown in mass, brownish-grey in transmitted light, 8–9 µm diam..................................................................................................................................................................... S. marjana

- Reticulum with 6–9 meshes across the spore..................................................................................................................................10

10. Spores gray-purple, brown-purple in mass, purple-brown in transmitted light, 7–9 µm diam., sporocarps 6–20 mm total height................................................................................................................................................................................................... S. fusca

- Spores dark brown in mass, purple gray in transmitted light, 8–9 µm diam., sporocarps 3 mm total height.................. S. foliicola

11. Spores in clusters................................................................................................................................................................ S. uvifera

- Spores free.......................................................................................................................................................................................12

12. Sporocarps large or medium 7–20 µm............................................................................................................................................13

- Sporocarps small up to 5 (7) µm.....................................................................................................................................................16

13. Sporocarps light brown, spores 5.0–7.5 µm diam., with very fine pale warts seen by oil-immersion.............................. S. axifera

- Sporocarps dark brown to black......................................................................................................................................................14

14. Capillitium without internal net, surface net with large meshes 60–275 µm diam.................................................... S. rhizoideipes

- Capillitium with internal and surface net........................................................................................................................................15

15. Surface net irregular, many expansions in the axils of the surface net capillitium............................................................... S. plana

- Surface net without many expansions in the axils of the surface net capillitium........................................................... S. splendens

16. Sporocarps light brown....................................................................................................................................................................17

- Sporocarps dark brown to black......................................................................................................................................................19

17. Stalk long, 1/3–1/2 of the total height................................................................................................................................ S. pallida

- Stalk short, 1/5 of the total height....................................................................................................................................................18

18. Sporocarps gregariously tufted on a common hypothallus. Hypothallus a rather thick, dark red brown membrane, darker at the stalk bases.......................................................................................................................................................................... S. graciliformis

- Sporocarps in groups. Hypothallus membranous, inconspicuous.................................................................................. S. herbatica 19. Spores small, up to 7 µm diam......................................................................................................................................... S. farrensis - Spores large 8.5–12.5 µm diam.......................................................................................................................................................20

20. Spore-mass black. Spores with long warts, up to 0.8 µm....................................................................................... S. mussooriensis - Spore-mass pale brown. Spores with short warts............................................................................................................................21

21. Capillitium smooth, not bearing spines internal. Internal net with 3–4 meshes across the radius..................... S. mediterraneensis

- Capillitium lax, with short thick, protrusions on the outside, rather wide, flat to rounded, all the axils rounded and with membranous expansions. Internal net with 1–2 meshes across the radius............................................................................................... S. laxifila