North American species of Mycena.

MYCENELLA: PSEUDOECHINULATAE

449

and others. The choice of Voglino's name appears to be satisfactory
enough for the fungus described above, but not for the material I
have placed in Rea's species or for M. nodulosa.
SECTION PSEUDOECHINULATAE
231. Mycena bisphaerigera (Lange), comb. nov.
Omphalia bisphaerigera Lange, Dansk Bot. Arkiv, 6 (5): 9. 1930.
Fayodia bisphaerigera KUhner, Bull. Soc. Linn. Lyon, 9: 68. 1930.
Illustrations:
Plate 98 B, Text fig. 55, no. 7 (p. 451).
Lange, Flora Agar. Dan., 2, pl. 59 H.
Pileus 5-20 mm. broad, obtusely conic to convex, sometimes with
an umbo, the margin usually slightly incurved at first, fuliginous to
watery gray (near "olive brown" or "buffy brown"), disc usually
darker, hygrophanous, fading to sordid pallid cinereous or nearly
white at times, when moist striate to the disc, opaque when faded;
flesh pale grayish, cartilaginous and flaccid to rather soft and fragile,
watery when moist, odor and taste mild (in the four-spored form),
farinaceous (in the two-spored form); lamellae bluntly adnate or with
a decurrent tooth in age, sometimes arcuate, close to subdistant, 15 -25 reach the stipe, one or two tiers of lamellulae, narrow to rather
broad (2.5-4 mm.), pallid grayish, stipe (2) 3-7 cm. long, 1-2.5 mm.
thick, equal, hollow, cartilaginous but fragile, rigid, flexuous or undulating, pale gray to nearly white, glabrous, somewhat translucent,
base with only a few scattered mycelial hairs.
Spores 7-9 (10) A on two-spored forms, 5.5-7 u on four-spored carpophores, globose, appearing echinulate under a 3-mm. objective,
actually with a smooth outer wall which is strongly amyloid, a thickened secondary wall with very minute pores through it giving the
spore a falsely echinulate appearance, and finally a smooth inner
membrane, the two inner walls nonamyloid; pleurocystidia and cheilocystidia not differentiated or the latter subfusoid, smooth, and 25-30
X 7-9 A; gill trama homogeneous, interwoven sordid pale brown in
iodine; pileus trama homogeneous beneath a thin pellicle, sordid
brown in iodine.
Habit, habitat, and distribution.-Single to gregarious under conifers or in bogs; New York, Michigan, Washington, Oregon, and California. Rather rare and occurring during late summer and fall.