North American species of Mycena.

PSEUDOMYCENA: BASIPEDES

57

Spores somewhat spheric or slightly elliptic-ovoid, rarely notched,
and pear-shaped at the apex, 8-10.5,, perhaps a little compressed
dorsiventrally; basidia remarkably short and inflated, 21-31 X 12.2 -13.7,, with four sterigmata; cheilocystidia clavate or ovoid, crowned
with very slender flexuous hairs; gill trama with rather large hyphae
(20-34, thick), distinctly amyloid; subhymenium indistinct; pellicle
of the pileus gelatinous, about 50, thick, its hyphae filiform (1-2.5 u
thick), the surface aeriferous, not granular-roughened but completely
covered with filiform, elongated, flexuous, obtuse, very slender hairs.
Habit, habitat, and distribution.-In small groups on mossy trunks
of hardwood trees, October to January; Europe. So far as I know,
this fungus has not been reported in North America, but it very
likely occurs here. Most of these minute forms are very widely
distributed though seldom identified because the collector rarely has
enough literature at his disposal at the time the material is fresh.
8. MYCENA LONGISETA von Hbhnel
Stizb. K. Acad. der Wiss. Wien, 118: 282. 1909 (Frag. zur Myk., 186)
Mycena codoniceps var. aciculata Smith, Mycologia, 29: 344. 1937.
Illustrations: Text fig. 2, nos. 1-2, 9 (p. 58).
Pileus 1-5 mm. broad, obtusely conic, margin flaring in age,
sometimes becoming convex, surface at first pubescent from a rather
dense covering of setae, becoming sparsely pubescent and finally
glabrous as the setae become appressed, translucent-striate but soon
sulcate, color dark bluish gray or brownish gray, becoming sordid
pallid gray to whitish, margin entire; flesh very delicate and fragile,
no odor or distinctive taste; lamellae narrow, narrowly attached or
nearly free, subdistant, faces and edges grayish or pallid; stipe 1-3 cm.
long, filiform, very soft and delicate, with a small rounded bulb at the
base, gray but whitish in age, covered with setae or nearly glabrous,
bulb also setose.
Spores 6-8 X 3-4,i, ellipsoid, pale yellowish in iodine; basidia
two- or four-spored; pleurocystidia not differentiated; cheilocystidia
abundant, 25-40 X 7-15 /, clavate to fusoid-ventricose, apex drawn
out to a needlelike projection or studded with several needlelike projections, some with the enlarged portion more or less echinulate in
addition; gill trama of vesiculose cells, vinaceous brown in iodine;
pileus trama composed of a thin gelatinous pellicle (often quite thick
when revived in KOH) and a tramal body of vesiculose cells, the