North American species of Mycena.

EUMYCENA: HYDROPUS

391

3. Spores up to 6 long...................................... 4
3. Spores regularly more than 6 gI long............................. 5
4. Spores globose, 3-4 j,; carpophores usually on hemlock
196. M. fuliginaria
4. Spores broadly ellipsoid, 4-5 X 3-3.5,; on Magnolia; southern United
States........................................ 01. M. seriflua
5. Pleurocystidia abundant; fusoid-ventricose.......... 200. M. brevipes
5. Pleurocystidia absent or, if present, rare and only near gill edges.... 6
6. Pileus covered with tangled pilocystidia......................... 7
6. Pileus without pilocystidia over surface; spores 9-11 X 5-6.5 p
197. M. taxodii
7. Spores 6-7.5 X 3.5-4 M; cheilocystidia abundant
198. M. marginella var. rugosodisca
7. Spores 7-9 X 4.5-6 /u; gills distant; cheilocystidia apparently absent
202. M. umbrina
196. MYCENA FULIGINARIA (Fr.) sensu Kiihner
Encyc. Myc. 10: 531. 1938
Collybia succosa Peck, Bull. Buffalo Soc. Nat. Sci., 1: 46. 1873.
Collybia atramentosa Kalchbrenner, Icon. Sel. Hymen. Hung., p. 15. 1873.
Mycena succosa Saccardo, Syll. Fung., 5: 293. 1887.
Collybia nigrescens Quelet, Bull. Soc. Bot. Fr., 23: 325. 1876.
Mycena atramentosa von Hthnel, Fragm., III, Mitt. n. 97. 1907.
Illustrations:
Bresadola, Icon. Myc., pl. 216, fig. 1.
Kalchbrenner, Icon. Sel. Hymen. Hung., pl. 6, fig. 2 (as Collybia atramentosa).
"Pileus 1-3 cm. broad, subcartilaginous, campanulate to convex,
cinereous-brown to fuliginous, minutely pubescent, margin incurved
and surpassing the gills. Flesh thickish, white at first becoming
purplish-black where wounded. Gills adnate with a slight decurrent
tooth, becoming emarginate, moderately broad, tapering in front,
close, whitish, turning blackish where bruised. Stem 2-5 cm. long,
2 mm. thick, equal, cartilaginous, compact except the stuffed axis,
often curved, clothed with afine,fuliginous pubescence, becoming blackish. Spores minute, globose-ovoid, 3-4 micr. in diameter, smooth,
white. Cystidia none; sterile cells on edge of gills, abundant, slender,
subfiliform. Odor and taste not marked.