North American species of Mycena.

MYCENELLA: NODULOSAE

447

under a lens), soon glabrous (the cystidia collapsing), "fuscous" to
black on the umbo, margin dark or light watery gray, fading to a
pallid sordid gray; flesh soft and pliant, pale fuscous, very thin, in
extreme age sometimes staining reddish brown, odor and taste not
distinctive; lamellae deeply adnexed to broadly rounded and depressed-adnate, moderately close, 27-33 reach the stipe, broad (5
mm.), whitish to glaucous gray and densely pruinose under a lens
from cystidia, spotted reddish brown in age; stipe 6-8 cm. long, (1)
2-3 mm. thick, with a pseudorhiza 4-8 cm. long, evenly covered with
a white-pruinose pubescence of hyaline cystidia, pliant, hollow, with
a sharply differentiated cartilaginous rind, fuscous at first, becoming
pale gray to whitish above.
Spores globose, 6-7 A, rough, with aculeae 2-3 X 0.5-92 A scattered
over the surface, nonamyloid; basidia four-spored, 28-34 X 7-8 p;
cheilocystidia and pleurocystidia similar and abundant, unbranched,
fusoid-ventricose with a greatly elongated neck, apices usually incrusted, 60-80 X 10-14 it; gill trama yellowish in iodine; pileus trama
corticated by a palisade layer of clavate basidium-like or contorted
cells measuring 18-22 X 5-9 u, elongated cystidia 100-150 X 7-9
(10) A projecting from this layer at intervals, the tissue beneath
homogeneous, and composed of compactly arranged filamentous
hyphae, yellowish in iodine; cystidia on the stipe similar to those on
the pileus, but more numerous.
Habit, habitat, and distribution.-Scattered on humus beside a
trail in a mixed Douglas fir and hemlock forest near Crescent Lake,
Washington, during October. It is known only from the Olympic
Peninsula.
Observations.-Because of the collapsible nature of the cells forming the surface of the pileus they are difficult to demonstrate in mounts
of dried material. The layer is most easily seen on young specimens.
The characters which readily distinguish the species are the pseudorhiza, the reddish stains which develop on the gills, and the palisade
layer forming the cuticle of the pileus.
230. MYCENA BRYOPHILA Voglino
Atti R. Ist. Veneto Sci., Lett. ed Arti, Venezia, 6 ser., IV: 617. 1886
Illustrations:
Text fig. 54, nos. 8-9 (p. 444).
Lange, Flora Agar. Dan., 2, pl. 58 F.
Smith, Am. Journ. Bot., 22, pl. 3, fig. 6 (as M. lasiosperma Bresadola).