North American species of Mycena.

MYCENELLA: NODULOSAE

445

New York, Michigan, and Washington in the United States and
Ontario in Canada. Atkinson (24158) found it in considerable
quantity near Ithaca, New York. Rare.
Material studied.-Smith, 32-456, 32-529, 33-705, 60, 446, 452,
1442, 1478, 1628, 4333, 4934, 6346, 6397, 7258, 7693, 10562, 10604,
10706, 10765, 14295. Atkinson, 24158, 24334 (as an undescribed
species). Hesler, 10173.
Observations.-The diagnostic characters of this fungus are the
branched cystidia, the lack of a pseudorhiza, and the tendency to
assume ochraceous colors in age. Lange's name has been used for the
American collections because of their perfect agreement with his
description and illustration. Kuihner believes that M. lasiosperma
Bresadola is the same, and uses that name because of its priority.
He apparently was strongly influenced by the similarity of the cystidia in the two. Bresadola, however, described M. lasiosperma as
larger, with a pseudorhiza, and as growing more or less cespitose on
wood. Size alone is a poor character, but the three mentioned above,
taken together, should not.be disregarded. I have examined about
two dozen American collections, and they consistently differ from
Bresadola's description as noted.
228. MYCENA TRACHYSPORA Rea
Trans. Brit. Myc. Soc., 12: 216. 1926
Mycena Cooliana Oort, Med. Neder. Mycol. Vereen, 16-17: 248. 1928.
Illustrations:
Plate 98 A; Text fig. 54, nos. 3-4.
Smith, Mycologia, 28, 412, fig. 1, no. 6.
Pileus (6) 10-20 (30) mm. broad, conic with an appressed margin
at first, soon campanulate, becoming expanded and umbonate, surface
appearing dry and densely hoary at first, polished at maturity, disc
"fuscous" to "bone brown" (blackish brown) at first, the margin
pallid to grayish, becoming paler over all in age, and often with a
tinge of ocher, faintly striate at first; flesh firm and cartilaginous, thin,
pallid or grayish, odor and taste not distinctive; lamellae moderately
close, narrow to moderately broad, oval in outline, narrowly adnate,
pale grayish to whitish, the margin pallid, densely pruinose under a
lens; stipe 4-19 cm. long, 1-2.5 mm. thick, equal, tough and cartilaginous, pallid gray above, darker and more brownish below,