North American species of Mycena.

EUMYCENA: ADONIDAE

185

equal above a narrowed crooked base, hollow, juice watery and
scanty, base sparsely fibrillose, apex faintly frosted, soon naked and
polished above, "coral pink" over all when fresh, soon becoming sordid
brown from the base upward and finally "bister" over the lower
portion.
Spores ellipsoid or pointed at one end, 7-10 X 4-5 At, nonamyloid;
basidia four-spored, 26-30 X 7-8 gi; cheilocystidia embedded, hyaline,
clavate, 28-35 X 9-12 /i, the enlarged portion covered with short
rodlike projections; no pleurocystidia; gill trama vinaceous brown in
iodine; pileus trama homogeneous beneath a thickish subgelatinous
(in KOH) pellicle, becoming vinaceous brown in iodine below the
pellicle.
Habit, habitat, and distribution.-Gregarious under pine; Washington and Oregon (3500 to 4500 feet elevation). It is one of the
species that occur in great quantity on beds of pine needles during
the fall. Itwas second only to M. rosella in abundance in the type
locality, McKenzie Pass, Oregon.
Material studied.-Smith, 8014, 8104, 17063, 18134.
Observations.-The beautiful pinkish-red color makes this one of
the most attractive species in the genus. A tinge of this color is
preserved in the dried specimens, so that the species can be readily
recognized from herbarium material. The change in the color of the
stipe reminds one of M. roseipallens and furnishes another valuable
macroscopic character. The gill edges are not margined, and there
is no evidence to indicate that the species is closely related to members of the Calodontes.
SUBSECTION IANTHINAE
KEY TO SPECIES
1. Pileus and stipe white............................ 85. M. subaquosa
1. Pileus and stipe colored vinaceous, purplish, lilac, etc.............. 2
2. Gills broadly adnate to arcuate, subdecurrent, not marginate
87. M. Kuehneriana
2. Gills sinuate to adnexed, not marginate............... 86. M. pura
2. Gills adnate to adnexed, marginate............................... 3
3. Spores 5.5-7 X 3-3.5,.......................... 88. M. pelianthina
3. Spores 7-9 (10) X (3.5) 4-5 g................. 89. M. rutilantiformis