North American species of Mycena.

258 NORTH AMERICAN SPECIES OF MYCENA

lactifers, pale brownish in iodine; pileus trama with a distinct pellicle
of narrow hyphae, a well-differentiated hypoderm the cells of which
are filled with a dark-brown pigment, the remainder floccose and the
hyphae rather narrow, all but the pellicle sordid brownish to yellowish
browi in iodine.
Habit, habitat, and distribution.-Scattered to gregarious on sphagnum in bogs during late spring and early summer; North Carolina,
New York, and Michigan. Probably common in bogs throughout
northeastern North America.
Material studied.-Smith, 32-94, 33-198, 33-532, 33-539, 33-564,
1275, 1285, 1330, 6256. Atkinson, 24128 (not typical). Hesler,
June 4, 1942.
Observations.-The best way to characterize this species is to say
that it is a long-stemmed odorless M. alcalina. Without question
it is a segregate of M. alcalina, but one which seems distinct enough
to be readily recognized. It often fruits in great quantity.
Mycena plumbea often has the stature of M. praelonga and both
have rather dark colors. The former, however, has a more brittle
stipe and a very conspicuous pruinose covering over the young pileus.
The spore size of the two is about the same, but the cheilocystidia of
M. plumbea are generally more mucronate. I have never seen it
stain reddish brown, but the stains are not always present on M. praelonga, so that the character is not a reliable distinction.
120. MYCENA FUSCO-OCULA A. H. Smith
Mycologia, 29: 338. 1937
Illustrations:
Text fig. 31, nos. 3-4, 6 (p. 257).
Smith, Mycologia, 929, figs. 1 a, b, c.
Pileus 5-15 (20) mm. broad, obtusely conic at first, becoming
more or less campanulate in age, sometimes convex, margin appressed
against the stipe when young, becoming sulcate-striate in age, surface
glabrous, moist, not viscid, color "fuscous" on the disc and "avellaneous" or "cartridge buff" elsewhere, in age drab to "pinkish buff,"
with a paler margin which may become tinged with pale tan; flesh
pallid, thin and pliant, odor and taste mild; lamellae ascending and
narrowly adnate, close to subdistant, 17-19 reach the stipe, narrow,
1.5-2 mm., whitish, densely pruinose from projecting cystidia; stipe
4-7 (10) cm. long, 1-1.5 mm. thick, tubular, equal, fragile, glabrous