North American species of Mycena.

190 NORTH AMERICAN SPECIES OF MYCENA

made from spore deposits. A study of herbarium specimens has not
verified any distinct spore differences. In dried material the spores
usually measure 5-7 (8) X 3 y. This is true even of those collections
in which the spores from deposits were larger. So far as my experience goes, each collection shows some difference in the abundance and
distribution as well as in the shape of the pleurocystidia.
87. Mycena Kuehneriana, sp. nov.
Illustration: Plate 24 B.
Pileus 1-2.5 cm. latus, convexus, glaber, striatus, griseo-vel brunneo-incarnatus, saepe sublilaceus; lamellae pallidae, late adnatae vel
decurrentes; stipes 3-6 cm. longus, 1.2-2.5 mm. crassus, subincarnatus, nitens, cavus; sporae 5-7.5 X 2.5-4.5 pu, amyloideae. Specimen typicum in Herb. Univ. Mich. conservatum. Legit A. H.
Smith, n. 11035, prope Ann Arbor, Mich., Sept. 8, 1938.
Pileus 1-2 cm. broad, convex, obtuse in age, fleshy, translucentstriate when moist, color pale avellaneous with a tinge of a mixture of
rose and lilac, almost white when faded, odor and taste of radish;
lamellae close, broad, arcuate, short-decurrent or very broadly adnate,
pallid or tinged rose-lilac; stipe 2-3 cm. long, 3-4 mm. thick above,
1-2 mm. below, glabrous, fragile, concolorous with the pileus.
Spores 5-6 X 2.5-3 u, amyloid; basidia four-spored; pleurocystidia
not seen; cheilocystidia scattered to rare, 50-60 X 10-14,u, subfusoid
to nearly cylindric, smooth.
Habit, habitat, and distribution.-Gregarious on mats of Polytrichum in oak woods; Michigan, and Manitoba (collected by Bisby).
Observations.-Mycena pseudopura Cke. sensu Kiihner is very
similar to M. Kiihneriana, which, however, differs in having distinctly
amyloid spores. Kiihner emphasized that the basidia and trama
were strongly amyloid, but that the spores were negative. I am inclined to believe that Kiihner's pseudopura is the same as M. Kiihneriana and that the iodine reaction in his material was aberrant. The
following account is taken from Kiihner:
Pileus 1-2.5 cm. broad, convex, sometimes submammillate, striatulate halfway or more to the disc, colored grayish or clear brown
mixed with flesh color or lilac, margin entire, sometimes whitish,
hygrophanous, fading from the disc outward, glabrous, not viscid;
flesh thin, fragile, pallid when dry, odor and taste slightly radishlike;
lamellae 24-25 reach the stipe, one to three tiers of lamellulae, sordid