North American species of Mycena.

EUMYCENA: DEMINUTIVAE

117

of rather broad hyphae, from which arise enlarged cells with verrucose
walls (much as in M. tenerrima).
Kiihner has also described var. citrina, which is pale sulphur yellow
over all in button stages and has spores 8.5-9.5 X 5.5-6 g. The
particles (inflated cells) on the surface of the stipe and pileus are
filled with droplets or granules of a bright citron-yellow color animated
by Brownian movement.
SUBSECTION ACICULAE
43. MYCENA OREGONENSIS A. H. Smith
Mycologia, 28: 413. 1936
Mycena siskiyouensis A. H. Smith, Mycologia, 28: 414. 1936.
Illustrations:
Plate 7 B; Text fig. 8, nos. 7-11 (p. 111).
Smith, Mycologia, 28: 412, fig. 1, no. 3.
Pileus 2-10 mm. broad, obtusely conic to convex, often with a
small papilla, margin appressed against the stipe when young, often
flaring somewhat in age and becoming wavy, the extreme edge frequently broken, striatulate when moist, faintly hoary at first but soon
polished, color "capucine yellow" on the disc, "deep chrome" toward
the margin, opaque after losing moisture but the colors hardly fading;
flesh thin, brittle, yellowish; odor and taste not distinctive; lamellae
adnate but developing a rather distinct decurrent tooth in age, distant
to subdistant or sometimes appearing close (depending on how well
the lamellulae develop), 10-12 reach the stipe and up to three rows of
lamellulae may develop, narrow, broadest at point of attachment,
"massicot yellow" or appearing whitish, edge "deep chrome" or
nearly white in old specimens; stipe 1-3 cm. long, 0.5-0.7 mm. thick,
equal, not fragile, evenly covered with a faint yellowish pubescence
or pruinosity, inserted on needles, base with scattered yellow hairs,
evenly colored and concolorous with or paler than the pileus.
Spores subcylindric, tapered to a point at one end, often slightly
curved, nonamyloid, 7-8 X 2.5-3 g (four-spored), 8-10 X 3.5-4 A
(two-spored); basidia 20-23 X 4-5 (6) t; cheilocystidia abundant,
30-45 X 9-192 g, subcylindric to fusoid-ventricose, smooth or
rarely forked at the apex, outlines often wavy, filled with a bright
sulphur-yellow substance; pleurocystidia similar, scattered to rare
(often very difficult to locate on sections of revived material); gill
trama yellowish in iodine; pileus trama with a thin adnate pellicle,