North American species of Mycena.

EUMYCENA: FLOCCIPES

379

189. Mycena turbinata (Murr.), comb. nov.
Omphalopsis turbinata Murrill, North Am. Flora, 9: 313. 1916.
Omphalia turbinata Murrill, Mycologia, 8: 220. 1916.
"Pileus convex to turbinate, usually umbonate, gregarious, 8-14
mm. broad; surface glabrous, hygrophanous, pale-grayish, becoming
lighter when dry, margin thin, pallid, even or faintly subplicate, appressed when young: lamellae long-decurrent, subdistant, rather
broad, concolorous: spores ellipsoid, pointed at one end, smooth,
hyaline, 7-8 X 4 A: stipe subcylindric, smooth, slightly pruinose,
concolorous above, darker below, firm, nearly solid, 3 cm. long, 1-1.5
mm. thick."
The type was collected on mosses on the ground at the New York
Botanical Garden. I have quoted Murrill's description. The type
is well preserved and consists of a good collection. The conic cap,
long-decurrent gills, and pale brown ("clay color") colors are distinctive of the dried carpophores. The spores measure 7-8 X 3.5-4 ji,
are ellipsoid, smooth, hyaline in KOH, and bluish in iodine (amyloid).
The basidia are four-spored. Pleurocystidia and cheilocystidia are
present; they are smooth and fusoid-ventricose but vary to near
cylindric in age. They project only slightly from the hymenium,
and measure 40-55 X 7-11,. The tramae of the pileus and gills
are each apparently homogeneous. They did not revive well, however,
and the presence of a pellicle and a hypoderm could not be accurately
determined.
SECTION FLOCCIPES
The three species grouped here are distinguished by their nonamyloid spores and floccose-scabrous stipes. They constitute a
related series of fungi which appear to have been derived from
the members of the Typicae having floccose stipes, such as M.
scabripes and M. trichoderma. The latter have amyloid spores.
KEY TO SPECIES
1. Gills with dark-brown edges; spores 6-8 X 4-5,.. 192. M. Kauffmanii
1. Gills not marginate; spores globose............................... 2
2. Pleurocystidia 60-90 /. long; spores 5-7............. 190. M. floccipes
2. Pleurocystidia rare (only near edge); spores 3.5-4 /.. 191. M. ulmicola