North American species of Mycena.

EUMYCENA: TYPICAE

307

also separate it from M. scabripes. From M. algeriensis it is readily
distinguished by its squatty appearance, plane to slightly depressed
pileus, and dark gills. Both, however, are quite similar in their
microscopic characters.
150. MYCENA ALGERIENSIS R. Maire in Ktihner
Encyc. Myc., 10: 490. 1938
Illustrations: Plates 64-66; Text fig. 37, nos. 1-4 (p. 308).
Pileus 1-3 (4) cm. broad, up to 2.5 or 3 cm. high, sharply or obtusely conic when young, becoming narrowly campanulate or conic
and in age broadly campanulate, occasionally convex with a low
umbo, margin appressed against the stipe at first, often flaring in age
and splitting, surface glabrous, radially rugulose, translucent-striate
when moist and mature, glistening and lubricous, color "fuscous
black" over all at first, becoming "fuscous," gradually becoming
paler to near "drab" (sordid grayish brown) and at that time translucent-striate, hygrophanous, fading to sordid brownish gray and
becoming slightly sulcate; flesh thin, soft, and fragile, dark grayish
or when faded whitish, not changing color when bruised. odor and
taste not distinctive; lamellae ascending-adnate and sometimes attached only by a tooth, close to crowded (or subdistant in small caps),
18-25 reach the stipe, three tiers of lamellulae (one of which extends
nearly to the stipe), narrow (2 mm. or up to 4 mm. in large caps),
whitish to pale grayish, much paler than the pileus, sometimes crenulate, under a lens pruinose from cystidia, edges even or somewhat
eroded; stipe 4-7 (12) cm. long, 2-3.5 mm. thick, equal or slightly
and evenly enlarged downward, hollow, very fragile and readily
splitting lengthwise when snapped off, base usually densely whitestrigose, densely or sparsely coated with white-fibrillose flecks over
at least the lower two thirds, glabrescent in age, concolorous with the
pileus (blackish to pale gray but never white), becoming translucent
in age and sometimes compressed, occasionally slightly longitudinally
striate.
Spores ellipsoid 7-8 (10) X 5-6, (or 7-10 X 6-7 p) in the twospored form, amyloid; basidia two- or four-spored, both may be found
on the same pileus, 24-28 X 5-6 /; cheilocystidia broadly fusoidventricose to ovoid, 38-52 X 9-18 L; pleurocystidia very abundant,
hyaline, broadly ventricose with obtuse apices, becoming subcylin