North American species of Mycena.

250 NORTH AMERICAN SPECIES OF MYCENA

on humus and debris in a mixed woods of Alnus rubra and Thuja
plicata; A. H. Smith, 18154, October 30, 1941, near McKenzie Pass,
Lost Creek, Oregon. It was also found in great abundance near
Detroit, Oregon, along the Santiam River in a similar plant association.
I have also seen material from Warrensburg, New York, but the specimens were not preserved.
Material studied.-Smith, 18154, 18178, 18179, 18180, 18181,
18182, 18183, 18184, 18210.
Observations.-The variety differs from typical material in lacking a pronounced bluish tint in the gray color, in its more cartilaginous consistency, and in the presence of pleurocystidia. There appears to be a slight difference in spore size if spores from deposits of
both are measured, but it is not always evident when one compares
only the dried material. In stature the variety is more like M.
longipes than M. stannea, and in its consistency it also approaches the
cartilaginous species.
116. MYCENA FRAGILLIMA A. H. Smith
Mycologia, 31:269. 1939
Illustrations: Text fig. 29, nos. 1-2.
Pileus (0.5) 1.5-3.5 cm. broad, obtusely conic, becoming broadly
campanulate or nearly plane in age, margin appressed against the
stipe at first and in age frequently flaring somewhat, surface covered
with a faint bloom but soon polished, moist to watery, dark watery
gray and then translucent-striate to the disc, becoming pale watery
gray or "hair brown" when still moist, hygrophanous and fading to
very pale cinereous; flesh very thin, watery and fragile, grayish to
pallid, odor and taste not distinctive; lamellae adnate or slightly
hooked, close in large caps, subdistant to distant in smallindividuals,
narrow, pallid grayish with even, whitish edges; stipe variable but
usually long and slender (3-7) 9-15 cm. long, (1) 1.5-2 (3) mm. thick,
usually decumbent, very fragile, pale watery gray and minutely
pubescent over all at first, soon polished and translucent, base whitestrigose and sometimes slightly bulbous.
Spores subovoid, pointed at one end, 7-9 (10) X 4-5 (5.5) t,
amyloid; basidia four-spored, 16-18 X 10-20 A, hyaline, smooth;
cheilocystidia forming a broad sterile band along the gill edge, broadly
fusoid with acute apices, which become drawn out into long narrow
necks (15-25 A, long) in age; pleurocystidia rare to absent, when present
similar to cheilocystidia; gill trama vinaceous brown in iodine; pileus