North American species of Mycena.

EUMYCENA: TYPICAE

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tain discrepancies in his description of the European fungus are apparent when it is applied to my specimens. I have never detected
an odor or a taste as noted by Ktihner, and my material was characteristically hygrophanous and very frequently had a glistening appearance after fading. In addition, thfe pleurocystidia are not very
abundant. For these reasons I venture to place the American and
European material in separate categories, although I readily admit
that in the dried specimens, aside from the abundance of pleurocystidia, one might not find any differences by which to distinguish them.
The characters I have used form the classical distinction between
M. aetites and M. stannea of Fries, and it seems to me desirable to
keep the Friesian name. M. murina, as I previously interpreted it,
is a simple growth form of M. stannea in which the striations are more
conspicuous than usual.
In my present conception of M. stannea I include any mediumsized fragile gray Mycena growing on the ground, with spores 8-11
X 5-7 At, and with scattered to rare ventricose pleurocystidia (if any
are present), which may or may not be furnished with obuse protuberances. The pileus is hygrophanous, and no distinctive odor
or taste is evident. The very fine radial striations which are sometimes quite noticeable and which are formed by the splitting of the
cuticle are a secondary character of little taxonomic significance. The
variation in the shape of the cystidia is similar to that found in M.
citrinomarginata.
114. MYCENA PLUMBEA (Fr.) SACCARDO
Syll. Fung., 5: 284. 1887
Agaricus (Mycena) plumbeus Fries, Hymen. Eur., p. 144. 1874.
Illustrations: Plates 44, 45 A; Text fig. 30, nos. 3, 5-6 (p. 253).
Pileus 1-3 cm. broad, subellipsoid, nearly cylindric in button
stages, margin appressed, becoming conic to obtusely campanulate,
finally convex, plane or umbonate, the margin often flaring in age,
surface hoary when young, slowly becoming naked, glabrous, moist,
translucent-striate, hygrophanous, opaque, and frequently sulcate
when faded, "dark mouse gray" at first (dark bluish black), becoming
"hair brown," "drab," and finally "drab gray" (or paler when faded);
flesh thin, grayish, very rigid and fragile, no odor or taste; lamellae
ascending-adnate at first, horizontally adnate in age or sometimes
toothed, subdistant, 93-28 reach the stipe, two or three tiers of lamel