North American species of Mycena.

EUMYCENA: DEMINUTIVAE

121

clavate to subfusoid or obovoid, apices often covered with a resinous
secretion (in mounts revived in KOH), 25-32 X 6-9 u, very inconspicuous on the gill edge and projecting only slightly from the faces;
gill trama yellowish in iodine, pileus trama with a thin differentiated
pellicle from which small scattered fusoid cystidia project, the region
beneath the pellicle of slightly inflated cells, the remainder filamentous, yellowish in iodine; stipe tissue yellowish in iodine.
Habit, habitat, and distribution.-Single, gregarious or subcespitose on debris in wet places, particularly along streams or the borders of swamps. It is widely distributed throughout the eastern
United States and Canada and occurs in Washington, Oregon, and
California along the Pacific coast. I find it most frequently during
the spring and early summer or during exceptionally wet weather in
the fall.
Material studied.-Smith, 32-64, 33-22, 33-147, 33-209, 33-334,
33-490, 1312,1373, 3969, 6308,6336,8324,8472, 13445,13702, 13884,
14139, 14176, 14240, 14584, 16416, 17557. Atkinson, 14666, 19851,
24079. Burke, 1942, Alabama. Hesler, 12439. Mains, 5063.
Jackson, 1936, Ontario, Canada. Josserand, 1937, France. Kauffman, collections from North Carolina, Michigan, Washington, and
Oregon.
Observations.-Davidson's report (1930) of this species from
British Columbia is doubtful. She more than likely found M. oregonensis, a species of similar stature, but one which does occur in
quantity on needle carpets. M. acicula, however, probably occurs
in British Columbia. The brilliant colors, the nonmarginate gills,
subfusoid rather large spores, slender stature, and cystidia distinguish
it from other members of the genus. It is quite likely to be mistaken
for a Hygrophorus by many.
45. MYCENA FIBULA (Fr.) Ktihner
Encyc. Myc., 10: 607. 1938
Agaricus (Omphalia) fibula Fries, Syst. Myc., 1: 163. 1821.
Omphaliafibula Qu6let, Champ. Jura et Vosges, p. 101. 1872.
Omphalopsis fibula Murrill, North Am. Flora, 9: 314. 1916.
Illustrations:
Text fig. 9, nos. 5-9.
Bresadola, Icon. Mycol., 6, pl. 275, fig. 1 (as Omphalia).
Hard, The Mushroom, Edible and Otherwise, fig. 99.
Konrad et Maublanc, Icon. Sel. Fung., 3, pl. 235-I (as Omphalia).
Lange, Flora Agar. Dan., 2, pl. 61 G (as Omphalia).