North American species of Mycena.

326 NORTH AMERICAN SPECIES OF MYCENA

2653, 5370, 7784, 8665, 10155, 10156, 10987. Kauffman, two collections (as 0. curvipes). Overholts, 1452, 1526, 2315.
Observations.-The microscopic characters of M. subalcalina,
Omphalia curvipes, and 0. semivestipes are identical. All are characterized by a thin gelatinous pellicle, very small spores (4-6 X 2-3,),
and cystidia which are smooth or somewhat contorted and branched
but which do not develop numerous fingerlike processes. Macroscopically they all have a rather tough cartilaginous consistency,
broadly adnate to subdecurrent, usually rather close gills, and the
same habit. Because of the more or less incurved margin of the
pileus one is likely at first to search for the species in either Collybia
or Omphalia. The structure of the pileus and the obvious relationship to M. tintinnabulum place it in Mycena.
This fungus was previously identified as M. tintinnabulum (Smith,
1937). Kiihner questioned this determination because of a difference
in the cystidia of the European and American material. In European
specimens the cystidia bear numerous short fingerlike projections,
which may become branched and quite contorted. In American
material the cystidia are essentially of the fusoid-ventricose type but
do fork or branch occasionally or become irregular in outline. This
difference between material from the two continents is no greater than
that which has been observed between different collections of M.
citrinomarginata, and so I was at first inclined to disregard it. It
must be admitted, however, that in this case the difference is constant. Material from Sweden and France as well as numerous collections from North America have been examined.
158. MYCENA OCHRACEICINEREA Murrill
Mycologia, 8: 221. 1916
Prunulus ochraceicinereus Murrill, North Am. Flora, 9: 333. 1916.
"Pileus thin, broadly convex, not umbonate, gregarious, 2 cm.
broad; surface smooth, glabrous, shining, pale-ochraceous-cinereous,
margin whitish, slightly striate: lamellae adnate with a decurrent
tooth, very few inserted, broad near the margin, subdistant, pallid:
spores oblong-ellipsoid, smooth, hyaline, about 7 X 4-5 g: stipe
cylindric, equal, smooth, glabrous, concolorous, nearly white at the
apex, pruinose at the base, 3-4 cm. long, 2 mm. thick.
"Type collected on decayed wood at Edgewater, New Jersey,