North American species of Mycena.

110 NORTH AMERICAN SPECIES OF MYCENA

The type has been examined and the following data have been
obtained: The spores are smooth, narrowly ellipsoid, amyloid, and
measure 5-6.5 X (2.5) 3-3.5 u. The basidia are four-spored. Pleurocystidia are not differentiated. The cheilocystidia are scattered to
abundant, 24-36 X 8-12 a, broadly or narrowly clavate with the
enlarged portion covered with short or elongated, often contorted or
branched, protuberances. The gill trama is homogeneous and pale
tawny brown in iodine. The pileus trama is characterized by a thin
pellicle, the cells of which give off numerous rodlike projections.
Beneath this is a fairly well differentiated hypoderm. The remainder
is floccose. Both the tramal body and the hypoderm are pale brown
in iodine.
I have occasionally collected specimens in New York, Michigan,
and Oregon, and Mains has one collection from New Hampshire (4163),
all of which appear to belong to this species, but I have never obtained
enough fresh material to allow me to arrive at a reliable species concept. The specimens referred to here could perhaps just as well be
classified as depauperate forms of the short-stiped form of M. atroalboides, in which the spores are slightly smaller than usual. The pilei
in my collections measured 3-7 mm. broad. Because of the small
spores the species is recognized provisionally. When it is finally
collected in quantity, it may be very easy to characterize accurately.
40. MYCENA CAPILLARIS (Fr.) Quelet
Champ. Jura et Vosges, p. 110. 1872
Agaricus capillaris Fries, Syst. Myc., 1: 160. 1821.
Pseudomycena capillaris Cejp, Publ. Fac. Sci. Univ. Charles, 104: 141. 1930.
Illustrations:
Plate 2 B; Text figs. 7, no. 13 (p. 91); 8, nos. 1-2.
Fries, Icon. Sel. Hymen., 1, pl. 84, fig. 6.
Lange, Flora Agar. Dan., 2, pl. 56 B (good).
Smith, Am. Journ. Bot., 22, pl. 3, fig. 5.
Pileus 2-6 (10) mm. broad, obtusely conic to convex, becoming
broadly convex to nearly plane, sometimes remaining campanulate,
margin appressed against the stipe at first, surface hoary but soon
polished and moist, pale or dark gray fading to whitish, the disc often
remaining darker or marked with a hyaline gray watery spot, translucent-striate, becoming sulcate-striate; flesh very thin or membranous, soft and fragile, whitish or grayish, odor and taste not