North American species of Mycena.

EXCLUDED AND DOUBTFUL SPECIES

483

Mycena integrella (Fr.) S. F. Gray.
This is Delicatula integrella (Fr.) Fayod.
Mycena jalapensis Murrill, Mycologia, 4: 73. 1912.
This is Pluteolus tropicalis Murrill, Mycologia, 4: 74. 1912 and
Bolbitius jalapensis Murrill, Mycologia, 4: 332. 1912.
Mycena lactea (Fr.) Quelet. See discussion of M. delicatella.
Mycena lepiotiformis Murrill, Mycologia, 8: 220. 1916.
Prunulus lepiotiformis Murrill, North Am. Flora, 9: 322. 1916.
"Pileus minute, broadly convex, not fully expanding, solitary,
3 mm. broad; surface dry smooth, white, minutely and densely
pubescent-scaly, margin entire, concolorous: lamellae subdistant,
rather broad, inserted, adnexed to nearly free, white to pale-yellowish: stipe short, filiform, smooth, white above, grayish-brown and
whitish pubescent below, 7 mm. long.
"Type collected on much decayed hemlock wood in woods at
Unaka Springs, Tennessee, August 18-24, 1904. IF. A. Murrill 716.
Known only from the type locality."
I have examined Murrill's collection. The basidia are four-spored
and measure 14-15 X 5-6,. The spores (only a few were found)
measure about 3 X 1.5,. They are very minute. Iodine reactions
were not obtained. No pleurocystidia or cheilocystidia were present.
The structure of the gill and pileus tramae was not clearly evident
in the sections, but neither appeared to possess any distinctive features. The dried specimen has the consistency of a small Lepiota,
and the species very likely belongs in that genus. No vesiculose cells
were found on the pileus.
Mycena lilacina (Mont.) Saccardo, Syll. Fung., 5: 257. 1887.
Agaricus (Mycena) lilacinus Montagne, Syll. Crypt., p. 110. 1856.
".. unicolor; pileo carnoso convexo-explanato centro umbilicato
lilacino laevi margine undulato fisso; stipite concolori spongiosofarcto laevi basi nudo; lamellis latis postice (in sicco) remotis antice
attenuatis e roseo ochraceis pulverulentis.
"Hab. In ligno dejecto, julio. Columbus; Sullivant, Icon.,
no. 90.