North American species of Mycena.

378 NORTH AMERICAN SPECIES OF MYCENA

cystidia abundant, somewhat similar to those on the gill edge, and
frequently clustered.
Habit, habitat, and distribution.-Scattered on sandy soil along
a road through an oak woods; July 10, 1935, Chelsea, Michigan.
A. H. Smith, 1507, same locality, July 22, 1935, 1590. Chelsea,
18354.
Observations.-The younger pilei remind one of M. misera, but
the smooth subeylindric cystidia easily distinguish this fungus from
that species. M. arenaria closely resembles M. pallida, but is readily
distinguished by its amyloid spores. A few fruiting bodies of a
species similar in appearance though differing in having globose
weakly amyloid spores 5-7 A in diameter was also found with the
material cited above. As yet my information on it is too incomplete
to enable me to describe it.
188. Mycena pseudogrisea (Murr.), comb. nov.
Omphalopsis pseudogrisea Murrill, North Am. Flora, 9: 314. 1916.
Omphalia pseudogrisea Murrill, Mycologia, 8: 220. 1916.
"Pileus convex-depressed, gregarious, 1-2 cm. broad; surface
glabrous, smooth, subhygrophanous, fuliginous, paler when dry,
margin concolorous, faintly striate, appressed when young: lamellae
inserted, not forking, decurrent, distant, broad, arcuate to plane,
pallid: spores ovoid, pointed at one end, smooth, hyaline, uniguttulate, 6-8 X 4 u: stipe cylindric, smooth, glabrous, subconcolorous,
apparently solid, 3-4 cm. long, 1-2 mm. thick."
Type collected on a rotten stump at Englewood, New Jersey, by
F. S. Earle (1911). Known from New Jersey and southern New
York. I have examined the type and found the tramae of the pileus
and gills to be homogeneous. Both pleurocystidia and cheilocystidia
are present but scattered. They are the fusoid-ventricose, smooth
type and measure 25-30 X 7-192,. The basidia are four-spored,
and the spores measure 6-7 X 3.5-4,. They are smooth, hyaline in
KOH, and bluish in iodine (hence amyloid). In age or when dried
the pilei are infundibuliform owing to the manner in which the margin
becomes uplifted. This is a rather tall cartilaginous, lignicolous
species which should be quite easily recognized by its habitat and
strongly decurrent gills.