North American species of Mycena.

230 NORTH AMERICAN SPECIES OF MYCENA

42. Spores ellipsoid; cheilocystidia 26-40 X 9-15 a; carpophore similar
to M. parabolica in appearance............................... a
(a) Odor none..................... 160. M. alnicola var. typica
(b) Odor of radish................. 161. M. alnicola var. odora
CHEILOCYSTIDIA ROUGHENED
43. Terrestrial and cartilaginous-pliant; stipe usually 8-12 cm. long and
sometimes rooting....................................... 44
43. Typically lignicolous or usually cespitose........................ 52
44. Pileus 5-15 (20) mm. broad.................................... 45
44. Pileus 15-30 (50) mm. broad................................... 47
45. Stipe with strong purplish to vinaceous tinge in apex at least; cap
more or less dark vinaceous brown............... 140. M. pullata
45. Vinaceous or purplish tints absent.............................. 46
46. Gills very broadly adnate, nearly horizontal in age.. 138. M. peltata
46. Gills ascending, adnate by slight tooth............... 139. M. vitilis
47. Spores 7-10 (11), long.................................... 48
47. Spores 9-13 (17),i long........................................ 51
48. Stipe longitudinally striate, at least when young.. 141. MI. polygramma
48. Stipe smooth and polished..................................... 49
49. Spores 8-11 X 3-4.5...................... 146. M. fagetorum
49. Spores 7-9 (10) X 5-7.5,...................................... 50
50. Spores 7-9 X 6-7.5.; pleurocystidia rare............ 142. M. magna
50. Spores 7-10 X 5-6.5 I,; pleurocystidia absent....... 143. M. longipes
51. Spores 12-17 X 6-8 A; stipe with long pseudorhiza
144. M. megaspora
51. Spores 9-13 X 4-5.5 (6) g; pseudorhiza lacking.. 145. M. griseiconica
52. Cheilocystidia fusoid-ventricose, with tendency to branch or develop
short projections, or basidium-like with somewhat irregular outlines, or not differentiated................................... 53
52. Cheilocystidia broad (10-18 pL) and mucronate or with several
rather long and thick projections.............................. 54
52. Cheilocystidia clavate, broad apices covered with numerous rodlike
projections or projections fewer and larger as well as irregular in
outline and manner of branching............................. 55
53. Cheilocystidia not differentiated; spores 7-9 X 6-7,
158. M. ochraceicinerea
53. Cheilocystidia clavate to basidium-like, outlines often irregular;
spores 4-5 X 2.5-3 i....................... 157. M. semivestipes
53. Cheilocystidia narrowly fusoid-ventricose, neck often with one or
more rodlike projections; spores 6-8 X 3-4..... 156. M. laevigata