North American species of Mycena.

476 NORTH AMERICAN SPECIES OF MYCENA

"Pileus conic to campanulate, gregarious, reaching 1.5 cm. broad
and 1 cm. high; surface dry, glabrous, striate, pale-isabelline or avellaneous, usually avellaneous on the disk, margin entire, pale isabelline,
appressed when young: lamellae adnate, slightly decurrent at times,
crowded, rather narrow, white: spores globose, smooth, hyaline,
4-5 p.; stipe cylindric, equal, smooth, glabrous, slightly pulverulent
at the apex, whitish, avellaneous at the base when the pileus is avellaneous, 3-4 cm. long, about 1 mm. thick.
"Type collected on dead sticks at Cinchona, Jamaica, about 1500
m. elevation, December 25-January 8, 1908-9, W. A. & Edna L.
Murrill 550 (herb. N. Y. Bot. Gard.).
"Distribution: Known only from the type locality."
Originally the type consisted of a good collection of carpophores,
but unfortunately the hymenium has been eaten off every cap by
beetle larvae. Only one specimen with traces of gills was found.
It was sectioned, and the only character which could be ascertained
was that the cheilocystidia were of the smooth fusoid-ventricose type.
In view of Murrill's errors on the spore size of other tropical species
no reliance can be placed on his measurements here. Since his description contains no outstanding character by which the species can
be recognized, the name should be discarded.
Mycena citricolor (Berk. & Curt.) Saccardo, Syll. Fung., 5: 263. 1887.
Agaricus (Mycena) citricolor Berkeley & Curtis, Journ. Linn. Soc., 10:
285. 1868.
Omphalopsis citricolor Murrill, North Am. Flora, 9: 316. 1916.
The following description is quoted from the North American
Flora, 9: 316: "Pileus small, thin, pellucid, convex, gregarious,
5 mm. broad; surface lemon-yellow: lamellae decurrent, few, concolorous: stipe glabrous, filiform, concolorous, 6 mm. long."
The species cannot be recognized until its microscopic characters
have been ascertained.
Mycena citrinella (Fr. ex Pers.) Quelet, Champ. Jura et Vosges, p. 108.
1872.
Agaricus citrinellus Fries, Syst. Myc., p. 155. 1821.
This species has been variously interpreted by European authors.
Murrill excluded it from the North American Flora. There are speci