North American species of Mycena.

472 NORTH AMERICAN SPECIES OF MYCENA

to Marasmius minutissimus. I have not found a species such as this,
but suspect it to belong in the vicinity of M. cylindrospora, from which
its smaller spores readily distinguish it. Its generic position should
be redetermined from a study of fresh material.
Mycena acuto-conica Clements, in A. F. Woods, Bot. Surv. Neb., 2:
38. 1893.
Prunulus acutoconicus Murrill, North Am. Flora, 9: 330. 1916.
"Pileus slightly membranaceous, persistently conical, acute,
viscous, smooth, bright yellow; stipe long, equal, smooth, yellowishbrown; lamellae free, linear, deep ochraceous when dry; spores oblongelliptical, 12 X 7-8,. Pileus 21 cm. wide by 3 cm. high. Stipe
6-7 cm. long. Distinguished by its persistently conical, bright yellow
pileus, and by the free ochraceous gills."
The original description has been quoted above. The type is
deposited in the University of Nebraska Herbarium. Through the
kindness of Dr. Leva B. Walker I was able to examine one of the
carpophores from the type collection. Its spores are 10-12 (14) X
6-7 y, ellipsoid, smooth, and nonamyloid. The basidia measure 40 -46 X 7-9 At and are mostly four-spored. A few bispored basidia were
also found. The trama of the gills is made up of long, regularly arranged hyphal cells and is nonamyloid. The pileus trama is characterized by a gelatinous pellicle, but this is difficult to demonstrate
because a great deal of sand is lodged in the pellicle and good sections
are hard to obtain. The yellow viscid conic pileus, size of the carpophore, and microscopic characters all clearly indicate that the fungus
is an Hygrophorus and without doubt H. Langii Ktihner. Since
Clement's name is the earliest, the combination Hygrophorus
acutoconicus (Clements, in Woods), comb. nov. must be made and
the following names become synonyms: Hygrocybe Langii Kiihner,
Le Botaniste, 18: 175. 1927; Hygrophorus Rickenii Maire, Bull. Soc.
Myc. Fr., 46:220. 1930; and H. Langii Dodge, Rhodora, 29:239.
1927.
Mycena alphitophora (Berk.) Saccardo, Syll. Fung., 5: 290. 1887.
Agaricus (Mycena) alphitophorus Berkeley, Journ. Linn. Soc., 15:48.
1877.
Prunulus alphitophorus Murrill, North Am. Flora, 9: 339. 1916.