North American species of Mycena.

88 NORTH AMERICAN SPECIES OF MYCENA

with the exception that the cystidia on the stipe were not abundant.
My description was taken entirely from collection 3476, Florence,
Oregon.
Kauffman described the gills as narrow. As can readily be seen
by comparing the descriptions of Kiihner, Kauffman, and my no.
3476, the gills are broader and better developed in large carpophores
and practically absent in the smallest. I do not regard the longer
stipe, broader gills, and larger pilei of the American specimens as
more than the usual variations among collections. The characters
of diagnostic value are the pilocystidia and caulocystidia, nonamyloid spores, and lack of pleurocystidia. Kauffman (1930) described
the spores as 4-5 X 3-3.5 /, but my measurements from the type
were 6-7.5 X 3-4,. Because of the similarity of 0. apiculata to
M. crispula in the characters just mentioned, Kauffman's species is
regarded as synonymous with Quelet's.
21. MYCENA MAURETANICA (Maire) Kiihner
Encyc. Myc., 10: 639. 1938
Omphalia mauretanica Maire, Bull. Soc. Myc. Fr., 44:43. 1928.
Omphalia cuspidata Quelet var. stenospora Lange, Dansk Bot. Arkiv, 6 (5):
18. 1930.
Illustrations:
Text fig. 4, nos. 9-10 (p. 74).
Lange, Flora Agar. Dan., 2, pl. 62 B.
Kiihner, Encyc. Myc., 10: 641.
Pileus 1-2 mm. broad, convex, sulcate-striate, pure white, membranous, fragile; lamellae remote, narrow to almost foldlike, adnate
or slightly decurrent; stipe 1 cm. long, filiform, white, pruinose, inserted on dead leaves.
Spores 10-12 X 2.5-3 i, smooth, subcylindric, nonamyloid; basidia
two-spored; no pleurocystidia or cheilocystidia observed; the gill
trama yellowish in iodine; pileus trama homogeneous, yellowish in
iodine, with numerous hyaline pilocystidia 26-38 (50) X 6-9 t, usually wavy in outline and broadest at the base, apex acute or subacute;
caulocystidia similar to pilocystidia or longer and more flexuous; stipe
tissue yellowish in iodine.
Habit, habitat, and distribution.-Scattered on dead leaves; Michigan and Washington.
Material studied.-Smith, 33-1065, 16607.
Observations.-The four-spored form was found in Washington
by Mains in 1941.