North American species of Mycena.

436 NORTH AMERICAN SPECIES OF MYCENA

Habit, habitat, and distribution.-Gregarious on humus under
conifers during August; Michigan. Very rare.
Material studied.-Smith, 33-706, 758. Mains, 34-53.
Observations.-As in M. odorifera, the thickness of the gelatinous
layers varies greatly, depending on moisture conditions. At the
time I studied fresh material the pleurocystidia escaped my observation. In sections of the dried material revived in KOH, stained in
phloxine, and crushed slightly by pressure on the cover glass, both
types were readily visible. The gill edges of this species became
gelatinized and somewhat inflated, but not to so great an extent as in
many species of this subgenus.
Mycena pelliculosa resembles M. vulgaris in many respects but is
distinguished by its pleurocystidia, its time of fruiting, and the slightly
larger spores. The difference in spore size was not appreciable in the
dried material from which text figures 52 and 53 were drawn. The
material examined indicates that the pileus of M. pelliculosa is more
regularly depressed in young or freshly matured fruiting bodies,
whereas in that of M. vulgaris the disc usually becomes depressed in
age.
224. MYCENA ODORIFERA (Pk.) Saccardo
Syll. Fung., 5: 295. 1887
Agaricus odorifer Peck, Ann. Rep. New York State Mus., 30: 39. 1878.
Prunulus odorifer Murrill, North Am. Flora, 9: 324. 1916.
Illustrations:
Plate 95 B; Text fig. 53, nos. 6-7 (p. 438).
Atkinson, Stud. Am. Fungi (1900 edition), fig. 97 (as M. vulgaris).
Pileus 4-10 (15) mm. broad, obtusely conic to convex, becoming
broadly convex and sometimes with a small conic umbo, usually
nearly plane with a somewhat depressed disc in age, the margin incurved slightly at first or nearly straight, spreading in age, surface
pruinose and hardly translucent-striate at first, often apparently not
viscid to the touch at first but soon becoming so, bluish to fuscous
gray over the disc, the margin whitish, in age becoming sordid gray
or brownish over all; flesh thin but relatively tough and cartilaginous,
pallid grayish to whitish, taste slight and hardly distinctive, odor
very pronounced (developing within a short time after the fruiting
bodies have been collected and persisting in the dried material),
fragrant (somewhat resembling that of Armillaria caligata); lamellae
adnate but soon arcuate and in age distinctly decurrent, close to sub