North American species of Mycena.

EUMYCENA: TYPICAE

227

12. Spores 8-11 X 5-6,; pleurocystidia present..... 132. M. hudsoniana
12. Spores 6-8 (9) X 4-5,1; pleurocystidia absent...... 131. M. piceicola
13. Cheilocystidia quite irregular in outline, projections (4-7) fingerlike
and often contorted; odor fragrant......... 127. M. alcaliniformis
13. Cheilocystidia more nearly verrucose to echinulate, only in age with
contorted fingerlike projections............................... 14
14. Pileus decidedly dark bluish drab or lilac gray..... 128. M. urania
14. Pileus drab gray to fuscous.................................... 15
15. Pleurocystidia rare to absent; in wet weather fruiting bodies sometimes staining sordid reddish in all parts (see M. plicosa and the
odorless form of M. constans, which may key out here also)
135. M. atroalboides
15. Pleurocystidia scattered, margin of cap becoming sordid ochraceous
in age; no other color change noted............. 134. M. subplicosa
FRAGILE SPECIES WITH SMOOTH CHEILOCYSTIDIA
16. Pleurocystidia present and usually very prominent................ 17
16. Pleurocystidia, if present, not with greatly elongated necks; cheilocystidia inclined to be branched.............................. 23
17. Pleurocystidia with highly refractive granular contents; spores 8-11
X 5-6 y....................................... 106. M. Sabali
17. Pleurocystidia not as above............................... 18
18. Spores 10-12 X 5-6 u (4-spored) (see M. galopus also)
120. M.fusco-ocula
18. Spores of 4-spored basidia smaller............................... 19
19. Pleurocystidia 36-50 X 6-11,................................. 20
19. Pleurocystidia 60-90 g long.................................... 21
20. Odor alkaline................................... 153. M. alcalina
20. Odor not alkaline; cap trama composed of contorted "metallic"
hyphae (lactifers?)................2..... 200. M. brevipes
21. Pileus without distinct pellicle, surface more or less covered with irregularly disposed pilocystidia 15-60 X 9-16, and with obtuse
apices.................................... 108. M. trichoderma
21. Not as above........................................... a
(a) Stipe glabrous; spores 6-8 g long......................... b
(a) Stipe furfuraceous, at least when young.................... 22
(b) Stipe 3-6 cm. long; on needle beds under conifers or on humus
under brush........................ 107. M. pseudotenax
(b) Stipe (4) 6-12 cm. long; on decaying wood of hardwoods
121. M. Kauffmaniana