North American species of Mycena.

EUMYCENA: DEMINUTIVAE

99

pruinose to minutely pubescent under a lens, inserted on fern stalks
by a naked base.
Spores 6-8 (9) X 3-4 p, ellipsoid, smooth, amyloid; basidia fourspored; pleurocystidia scattered and difficult to find, similar to the
cheilocystidia; cheilocystidia 24-32 X 8-11,, fusoid-ventricose, hyaline, with obtuse to subacute apices, the neck often almost entirely
lacking; gill trama homogeneous, yellow in iodine; pileus trama
homogeneous, yellowish in iodine, with a thin pellicle of narrow (3-5 /
thick) hyphae which give off numerous short rodlike projections.
Habit, habitat, and distribution.-Gregarious on fern debris, in the
sand; November 14, 1935, Siltcoos Outlet Forest Camp, Florence,
Oregon.
Material studied.-Smith, 3488, 3740.
Observations.-In its cystidia, spores, and foldlike gills this species
resembles M. paucilamellata, but is at once distinguished by the size
and shape of the spores. The gills vary between the type found in
M. paucilamellata and the normal type. This discovery, of course,
does not rule out the character "foldlike" in distinguishing species of
agarics, but does indicate the need of caution in its use. Like most
characters, it is variable, more so in some species than in others, and
the range of variation must be determined for each.
31. Mycena kalalochensis, sp. nov.
Illustrations: Text figs. 5, nos. 1-4 (p. 81); 6, no. 10 (p. 85).
Pileus 3-8 mm. latus, convexus demum planus, albidus, pruinosus,
non hygrophanus; lamellae adnatae, latae, distantes, albidae; stipes
3-7 mm. longus, 0.5 mm. crassus, albidus, pruinosus, aequalis;
sporae 8-11 X 5-6 t, amyloideae; pleurocystidia 22-30 X 5-9 i,
fusoide ventricosa; cheilocystidia 36-62 X 6-10 u. Specimen typicum in Herb. Univ. Mich. conservatum. Legit A. H. Smith, n.
13035, prope Kalaloch, Wash., April 30, 1939.
Pileus 3-8 mm. broad, convex, remaining broadly convex, margin
incurved at first, spreading in age, chalk white and appearing pruinose
under a lens at first, glabrous and uneven in age but remaining chalky,
slightly sulcate at maturity, not hygrophanous; flesh membranous
and pliant (but not reviving), odor not distinctive, taste not recorded;
lamellae adnate, broad, distant, 10-12 reach the stipe, two tiers of
lamellulae, white over all, edges pruinose; stipe 3-7 mm. long, less