North American species of Mycena.

EUMYCENA: DEMINUTIVAE

79

25. Pileus brown, reddish brown, pink, or bright red................. 26
25. Pileus essentially blackish to grayish or occasionally developing sordid-brown colors...................................... 30
26. On dead remains of Typha or Carex.......................... 27
26. On dead parts of ferns........................................ 28
26. On dead parts of other plants................................. 29
27. Spores 11.5-14 X 3.5-5..................... M. tubarioides, p. 106
27. Spores 9-11 X 5-6 I.............................. 36. M. juncicola
28. Pileus white, with brownish disc............... M. Lohwagii, p. 108
28. Pileus grayish to grayish vinaceous (not bright red)... 38. M. tenella
28. Pileus coral red at first, gradually fading.......... 35. M. pterigena
29. Spores narrowly ellipsoid, with tapered and curved apiculus
37. M. Smithiana
29. Spores broadly ovoid, apiculus not prominent....... 38. M. tenella
30. Spores globose to subglobose or very broadly ellipsoid............. 31
30. Spores ellipsoid (gray species with slender stipes, but arcuate or more
or less decurrent gills should be sought for in the Omphaliariae).. 32
31. Pileus pale, margin whitish................ M. Quercus-Ilicis, p. 116
31. Pileus dark to sordid fuscous....................... 42. M. supina
32. Cheilocystidia hairlike but contorted.............. 176. M. Brownii
32. Cheilocystidia clavate-echinulate............................... 33
33. Spores 5-6 X 3-3.5 g (small forms of M. constans, M. atroalboides, or
M. alcaliniformis may key out here).......... 39. M. minutissima
33. Spores larger (8-10,u or more long)............................. 34
34. Spores 9-12 X 5-7, (2-spored); base of stipe strongly strigoseechinulate..................................... 41. M. mirata
34. Spores 8-10 X 4-5 g (4-spored); 11-13 X 5-6 g (2-spored)
40. M. capillaris
35. Pileus brightly colored......................................... 36
35. Pileus with dull colors (violet brown, gray or olive-yellowish brown) 37
36. Spores 9-11 X 3.5-4 pg (4-spored); pileus scarlet at first, on hardwood
debris......................................... 44. M. acicula
36. Usually on moss; spores 4.5-6 X 2.5-3 IL; gills long-decurrent
45. M. fibula
36. Under conifers; spores 7-8 X 2.5-3 g............. 43. M. oregonensis
37. Pleurocystidia abundant and conspicuous................:... 38
37. Pleurocystidia, if present, not conspicuous.;..............;;.. 40