North American species of Mycena.

EUMYCENA: TYPICAE

231

54. Pileus blackish when fresh, becoming pale gray, margin conspicuously sulcate-striate; spores 9-11 g, long........ 162. M. parabolica
54. As above, but spores 6-9 g....................... 160. M. alnicola
54. Pileus, stipe, or gills or all parts developing strong pinkish to reddish
tints or stains in age or when bruised; on hardwood logs and debris
163. M. rubrotincta
54. Pileus, gills, or stipe and hairs at base of stipe developing tawny to
sordid-tan colors in age; on wood of pine...... 164. M. intertexta
55. Stipe covered (sparsely in some) with white-fibrillose flecks, at
least when young............................. 165. M. inclinata
55. Stipe glabrous from beginning (apex may be pruinose).............56
56. Spores 3-5,. wide.......................................... 57
56. Spores 5-7 gi wide............................................. 59
57. Gills soon stained with sordid-reddish stains....... 167. M. maculata
57. Gills not stained as above...................................... 58
58. Cheilocystidia very irregular, varying from smooth to covered with
rodlike projections, apices frequently elongated and contorted
168. M. occidentalis
58. Cheilocystidia clavate, apices covered with short rodlike projections;
spores 7-9 X 4-5 g....................... 169. M. hemisphaerica
58. Cheilocystidia as above; spores 5-7 X 4-5.5 1,.. 166. M. subinclinata
59. Pileus very pale ("deep olive-buff") often appearing whitish (but
young caps distinctly pale gray); spores 6.5-8 X 5.5-7 A or 8-9 X
5-7 M (2-, 3-, 4-spored)....................... 172. M. radicatella
59. Pileus darker, fuscous when young; spores 8-10 (11) X 5-7,...... 60
60. Odor and taste farinaceous to raphanoid; often with pseudorhiza
170. M. galericulata
60. Odor and taste none; pseudorhiza, if present, very short
171. M. rugulosiceps
SPECIES OF UNCERTAIN POSITION
105. MYCENA SYRINGESCENS Murrill
Bull. Torr. Bot. Club, 67: 235. 1940
Prunulus syringescens Murrill, ibid., p. 234.
"Pileus convex, not expanding, solitary, 1 cm. broad; surface dry,
smooth, glabrous, opaque, pale-avellaneous, margin even, entire;
context membranous; lamellae sinuate with decurrent tooth, broad,
inserted, distant, pallid, toothed; spores ovoid, smooth, hyaline, 1 -guttulate, about 5 X 3,; cystidia none; stipe equal, smooth, gla