North American species of Mycena.

EUMYCENA: TYPICAE

331

when mature and moist, becoming sulcate-striate; flesh thin and
fragile, gray, odor and taste mild; lamellae ascending, adnate, usually
not toothed, subdistant, 20-30 reach the stipe, two tiers of lamellulae,
narrow to moderately broad (2 mm. -), equal, color "pale gull gray,"
intervenose, edges even; stipe 4-6 cm. long, 1.5-2 mm. thick, fragile,
equal, hollow, base somewhat strigose, the upper part at first covered
with a dense white bloom, soon polished and moist, "dark Quaker
drab" to "dark mouse gray" (with a distinctly bluish cast), at first
concolorous with pileus at maturity.
Spores (6) 7-9 (10) X 4-5 u, amyloid, ellipsoid, smooth; basidia
four-spored; cheilocystidia 26-40 X 9-15,, clavate to broadly fusoid,
becoming elongated, subeylindric, fusoid-ventricose or sometimes
with one or two fingerlike protuberances, the apices smooth or with a
slight resinous incrustation when revived in KOH; pleurocystidia
similar to cheilocystidia, rare to scattered; gill trama of inflated cells,
homogeneous, pileus trama with a thin pellicle, a strongly differentiated hypoderm, and a narrow region of filamentous tissue, all but the
pellicle vinaceous brown in iodine; stipe and gill trama also pale
vinaceous brown in iodine.
Habit, habitat, and distribution.-Cespitose to scattered on Alnus
logs; Olympic Mountains, Washington. The type (14559) was collected near the Elwha River Ranger Station, June 23, 1939. Additional material was collected along the Clearwater River.
Material studied.-Smith, 13237, 13691, 14203, 14442, 14562,
16581, 16582, 17235. C. A. Brown, November 4, 1925, Washington.
Observations.-This species is intermediate between M. parabolica
sensu Kauffman and M. griseiconica Kauffman. It is sharply distinct from both because of its smaller spores. It was found growing
along with M. griseiconica in the Elwha River Valley. Both pileus
and stipe of young specimens show considerable variation in color,
but nearly always a strong shade of bluish gray prevails beneath the
hoary bloom. In age the entire fruiting body becomes glaucous gray.
The colors of the fragile gray Mycenae ordinarily are not distinctive,
but in this species the bluish-gray cast is more pronounced than usual.
161. MYCENA ALNICOLA var. odora, var. nov.
Pileus 1-3 cm. latus, conicus demum campanulatus vel subplanus,
canescens, fuscus dein cinereus, striatus; caro cinerea; odor subraphanoideus; lamellae subdistantes, angustae; stipes 4-6 cm. longus,
1.5-2.5 mm. crassus, glaber, cinereus; sporae 7-9 (10) X 4.5-5.5!p;
cheilocystidia 36-48 (53) X 9-14 u, mucronata.