North American species of Mycena.

EXCLUDED AND DOUBTFUL SPECIES

491

sulcate, cartilaginous, tough, strict and elastic, with a watery juice,
becoming dark vinaceous when crushed. Odor and taste none. Spores
9-11 (12) X 5-6 (7),, ellipsoid, acute at apiculate end, hyaline,
smooth; cystidia none; sterile cells on edge of gills saccate but indistinct; surface layer of pileus corticate, composed of 3 to 4 rows of
subglobose, vesiculose, rather large cells.
"On decayed wood and needle beds of hemlock. Cespitose to
solitary. Mt. Hood, Oregon. October 7 and 16. Collected by
C. H. Kauffman.
"It belongs to the section Lactipedes by virtue of the rather
copious watery juice of the stem, which stains the crushed flesh wine
color. In other respects, it could be referred to the Filipedes. In
age the drab and fuscous colors of the cap may fade. In addition
to the juicy stem it is distinguishable from its relatives by the lack
of odor, the narrow, subdistant gills, the spore characters, and the
absence of cystidia. When growing on wood the stems may be
dwarfed."
Among Kauffman's collections there are three, all from Mt. Hood,
Oregon, which he identified as this species and upon which he based
his description and comments. The first is dated October 7; the
second, October 12, and the last, October 16. I have sectioned the
carpophores in all three.
The cheilocystidia in the first collection are fusoid-ventricose and
smooth, (25) 30-40 X 9-12,, embedded in the gill edge and with only
the tapered neck projecting. The spores measure 6-8 X 4 t, and are
strongly amyloid. The basidia are 28-30 X 5-6 /u. There are about
five dried carpophores in the collection, and they impress one as
belonging to the old section Fragilipedes of Fries.
The second collection is the short-stiped form Kauffman mentioned in his discussion. Its cheilocystidia measure 28-37 (42) X
7-12 iu, are hyaline, clavate, and with the upper portions covered
with short straight or flexuous rodlike projections. The basidia are
30-32 X 5-6 u and are four-spored. The spores are 7-9 (10) X
4-5,, ellipsoid, and strongly amyloid. The species is clearly in the
Friesian section Rigidipedes.
The last collection (October 16) is the one photographed and
illustrated on his plate 9. Its cheilocystidia are clavate and hyaline,
and their upper portions are covered with rodlike projections. They
are very abundant and form a broad sterile band along the gill edge.
They are 20-24 X 8-12 u. The basidia are two-spored and measure