North American species of Mycena.

294 NORTH AMERICAN SPECIES OF MYCENA

lamellae adnate, broad, rather distant, whitish: spores subglobose,
smooth, hyaline, 6-7.5 1,: stipe compressed, equal, smooth, glabrous,
avellaneous, 5-8 cm. long, 2-4 mm. thick.
"Type collected on the ground in woods near Seattle, Washington,
October 20-November 1, 1911, W. A. Murrill 463 (herb. N. Y. Bot.
Gard.).
"Distribution: Washington and Oregon."
I have not seen fresh material. The spores of the type are strongly
amyloid, smooth, broadly ellipsoid to subglobose, and are borne on
two-spored basidia. They measure 7-9 X 6-7.5 A. Pleurocystidia
and cheilocystidia are present but embedded and difficult to locate.
They measure 28-34 X (6) 8-12, and have short projections over
the clavate apex. The structure of the pileus trama is similar to that
of M. longipes, except that the lactifers are less numerous.
Mycena longipes and M. magna impress me as being the same species. Mounts of spores from the types of both were compared, and
enough intergradation of both size and shape was noted to make one
question a separation on spore characters alone. The pleurocystidia
of M. magna are so difficult to locate and so scattered that I hesitate
to use their presence as distinctive. It seems best, however, to recognize both species-at least until a critical study can be made from
fresh specimens. M. rugulosiceps should be readily distinguished by
its larger spores and lignicolous habit.
143. MYCENA LONGIPES Murrill
Mycologia, 8: 220. 1916
Prunulus longipes Murrill, North Am. Flora, 9: 338. 1916.
Illustrations: Text fig. 35, nos. 1-2.
"Pileus convex, umbonate, rather tough, solitary, 2.5 cm. broad;
surface smooth, dry, glabrous, very pale avellaneous, isabelline on the
umbo, margin entire, pallid, finely striate: lamellae deeply sinuate
with a decurrent tooth, subcrowded, arcuate, white: spores broadly
ellipsoid, smooth, hyaline, granular, 8-10 X 6-7,: stipe smooth,
glabrous, polished, equal, hollow, snow-white above, very pale avellaneous below, 15 cm. long, 2-3 mm. thick.
"Type collected in leaf-mold under redwoods in Muir Woods,
California, November 22, 1911, W. A. Murrill 1132 (herb. N. Y.
Bot. Gard.).
"Distribution: Known only from the type locality."