North American species of Mycena.

364 NORTH AMERICAN SPECIES OF MYCENA

Habit, habitat, and distribution.-Scattered on decaying stems of
Rubus; November 1, 1925, Lake Quinault, Washington. Known
only from the type locality.
Observations.-This fungus was among Kauffman's unidentified
collections. The habit is that of M. brevipes, for it is scattered on
dead sticks, but the two have little else in common. Its relationships
are obviously with M. concolor, from which the bulbous stipe, spores,
and cheilocystidia distinguish it. It is named in honor of its collector,
Dr. C. A. Brown, who accompanied Kauffman on his expedition to
Lake Quinault in 1925.
178. MYCENA PRAEDECURRENS Murrill
Mycologia, 4:165. 1912
Omphalopsis praedecurrens Murrill, North Am. Flora, 9: 314. 1916.
Illustration: Murrill, Mycologia, 4, pl. 68, fig. 4.
"Pileus conic to subturbinate when young, then umbonate, and
at length nearly plane, densely gregarious to subcespitose, reaching
1.5 cm. broad and nearly 1 cm. high; surface glabrous, very slightly
viscid when wet, avellaneous, with darker avellaneous umbo; margin
straight, appressed, usually striate, often yellowish-white: lamellae
long decurrent, distant, nearly plane, inserted, entire, white with an
ashy tint, acute at each end; spores ovoid, smooth, hyaline, 5 X 3 -3.5 A; stipe enlarged at the apex, subglabrous, gelatinous-white,
avellaneous at the base, slightly viscid when wet, stuffed, about 4 cm.
long and 2 mm. thick.
"Type locality: The Bronx, New York City.
"Habitat: on a mossy bank filled with slender roots in moist
deciduous woods.
"Distribution: Known only from the type locality."
The type consists of a good collection. The spores measure 4-5
X 3-3.5 j and are ellipsoid, smooth, hyaline, and amyloid. The
basidia are four-spored. The pleurocystidia are narrowly fusoidventricose, with obtuse apices and rather thick, slightly tapered necks.
They are smooth and hyaline, and frequently the walls are irregular
in outline (the material was revived in KOH). The irregularity may
be caused by their not reviving completely. Cheilocystidia are
numerous and similar to the pleurocystidia. The tramae of the gills
and the pileus are characterized by the presence of numerous lacti