North American species of Mycena.

96 NORTH AMERICAN SPECIES OF MYCENA

It is the presence of these hyphae which indicates a relationship with
M. delicatella. The spores, of course, readily distinguish the two.
27. MYCENA IGNOBILIS (Joss.) Kiihner
Encyc. Myc., 10: 667. 1938
Omphalia ignobilis Josserand, Ann. Soc. Linn. Lyon, 80: 94. 1937.
Pileus 2-5 (7) mm. broad, flat or very broadly convex when
young, soon turbinate-obconic or in age the disc broadly depressed
(owing to the elevated margin), shining watery white and striate to
the apex when moist, soon fading and then appearing minutely
flocculose (under a lens), the margin at times crenate or lobed and
usually slightly incurved at first; flesh membranous, odor and taste
not distinctive; lamellae very distant, long-decurrent, triangular and
broadest in the middle in age, pure white, one or two tiers of rudimentary lamellulae sometimes present; stipe 1-2 cm. long, about
0.5 mm. thick, equal, fragile, pure white, base naked.
Spores 7-9 X 3.5-4,, ellipsoid, smooth, nonamyloid (yellow to
yellowish brown in iodine); basidia four-spored; cheilocystidia and
pleurocystidia not differentiated; gill trama and pileus trama homogeneous, yellowish in iodine and not otherwise distinctive.
Habit, habitat, and distribution.-Gregarious on mud; California
and Michigan. Rare and apparently fruiting only during periods of
very wet weather. I have not found it along the edges of swamps
and on low ground in the woods, but, instead, it occurs in open pastures that under ordinary weather conditions are fairly dry.
Material studied.-Smith, 1392. C. O. Smith, June 25, 1935,
Riverside, California.
Observations.-The spore size appeared to be quite variable in the
collection (Smith, 1392) from which the description above was taken.
In one cap they were 6-7 X 3.5-4,t, but in the others 7-9 X 4 l was
the typical range. Kuhner gives the size as 9-10 g long, but Josserand has indicated a variability of 7-11 A.
28. Mycena papillata (Peck), comb nov.
Omphalia papillata Peck, Ann. Rep. New York State Mus., 51: 285. 1898.
Omphalopsis papillata Murrill, North Am. Flora, 9: 311. 1916.
"Pileus membranaceous, conical or campanulate, nearly even,
papillate at the apex, pure white; lamellae few, distant, arcuate and