North American species of Mycena.

418 NORTH AMERICAN SPECIES OF MYCENA

reaction of the spores distinguishes it at once, as do its cheilocystidia
and plicate-striate cap. For the same reasons it cannot be considered
closely related to the members of the section Viscosae although,
when dried, carpophores do remind one of a squatty M. epipterygia.
SECTION VISCOSAE
913. Mycena griseoviridis, sp. nov.
Illustrations: Plate 91; Text fig. 52, nos. 1-2.
Pileus 1-3.5 cm. latus, obtuse conicus vel convexus, crenatus,
pruinosus, viscidus vel glutinosus, olivaceo-fuscus vel citrino-fuscus;
sapor et odor farinaceo-rancidus; lamellae adnatae, confertae vel
subdistantes, latae, griseo-albidae vel citrino-griseae, rufomaculatae;
stipes (3) 5-9 cm. longus, 1-2.5 mm. crassus, aequalis, pruinosus,
viscidus; luteo-citrinus demum pallide griseus; sporae 9-11 X 5-6.5 Ms;
basidia tetraspora; cheilocystidia 30-60 X 6-11 M, distinctissima.
Specimen typicum in Herb. Univ. Mich. conservatum. Legit A. H.
Smith, n. 15498, prope Ann Arbor, Mich., Oct. 30, 1940.
Pileus 1-3.5 cm. broad, ovoid when young, soon becoming broadly
conic to convex, in age broadly campanulate to convex, margin exceeding the gills and appressed against the stipe when young, soon
lacerated or crenate and frequently flaring, conspicuously whitepruinose over all and only slowly becoming naked and polished,
glutinous, pellicle separable, opaque to faintly translucent-striate,
merely slightly sulcate along the margin in age, "deep olive" to "olive
brown" to "clove brown" and finally blackish, sometimes "Chaetura
black" with a hoary sheen when young, thin, tenacious, dark grayish
citrine becoming greenish brown in age, odor and taste strong, reminding one of green cucumbers or much more disagreeable; lamellae
ascending-adnate, with a slight tooth in age, close to subdistant, 16 -22 reach the stipe, moderately broad, white with a greenish tinge,
soon greenish gray and becoming spotted with reddish-brown stains,
edges even and pallid; stipe (3) 5-9 cm. long, 1-2.5 (3.5) mm. thick,
equal, terete or compressed, tenacious, tubular, base somewhat whitestrigose, densely white pruinose over all at first, finally naked and
shining, very viscid, "light dull green yellow" to "courge green,"
sometimes rather bright yellowish fading to pearly gray and usually
sordid purplish brown toward the base.
Spores ellipsoid, 9-11 X 5-6.5 g, amyloid (reaction weak); basidia