North American species of Mycena.

EUMYCENA: TYPICAE

271

a rare species, known in North America from Michigan, North Carolina, and Tennessee.
Material studied.-Smith, 33-100, 33-548, 6374, 9824, 10776,
10829, Michigan, 1931.
Observations.-Fries described the stipe as flaccid and the gills as
white. In my collections the stems were usually rigid enough to hold
the small caps upright, although fruiting bodies from mossy places
are often somewhat decumbent. In addition, the gills were always
dark at maturity. Such differences do not seem sufficient to justify
separating the American specimens as a distinct unit, particularly
when it is remembered that the species is very poorly known in
Europe. As interpreted here, it is characterized by its predominantly
blue color, small stature, and echinulate cystidia. It is not closely
related to M. amicta and M. subcaerulea. Its colors as well as other
characters sharply distinguish it. Its relationships appear to be here
with the small fragile gray to brown species having echinulate cheilocystidia.
199. MYCENA PSAMMICOLA (Berk. & Br.) Saccardo
Syll. Fung., 5: 275. 1887
Agaricus psammicola Berkeley & Broome, Ann. and Mag. Nat. Hist., Ser. 4,
17:130. 1876.
Illustrations:
Plate 49 C; Text fig. 32, nos. 7-8 (p. 268).
Smith, Mycologia, 27, fig. 2 b.
Pileus (5) 10-15 mm. broad, obtusely conic but soon narrowly
campanulate, becoming broadly campanulate, broadly conic or expanded and umbonate, the umbo usually abrupt and obtuse, margin
appressed against the stipe when young, sometimes flaring slightly at
maturity, moist, opaque at first but becoming translucent-striate,
glabrous and smooth, hygrophanous and fading rapidly, sulcate when
faded, "russet" to "tawny" over all when moist and fresh, the margin
soon "ochraceous tawny" and the disc "Mars brown," sometimes the
umbo nearly "fuscous," fading to "tawny olive" on the disc and
"wood brown" on the margin, in age paler and "ochraceous tawny"
to "cinnamon buff"; flesh concolorous with the surface, fragile, thin,
taste mild or very faintly of radish, odor developing after the specimens have been collected, rather sharp and fragrant, somewhat like
that of iodoform; lamellae ascending but bluntly adnate, slightly