312 NORTH AMERICAN FLORA [ VoLumE 9 
4, Omphalopsis albidula (Peck) Murrill. 
Omphelia albidula Peck, Ann. Rep. N. VY. State Mus. 49: 17. 1896. 
Pileus thin, convex, umbilicate, 8 mm. broad; surface glabrous, whitish, margin distantly 
striate: lamellae decurrent, distant, broad, white: spores subellipsoid, apiculate at one end, 
7.5-10 X 5-6 uw: stipe glabrous or mealy at the apex and strigose at the base, white or whitish, 
slender, solid, 1.5-2.5 cm. long, 1 mm. thick. 
TYPE LOCALITY: Mechanicville, New York. 
Hapirat: On bark of deciduous trees. : 
DIsTRIBUTION: Known only from the type locality. 
5. Omphalopsis corticola (Peck) Murrill. 
Omphalia corticola Peck, Ann. Rep. N. Y. State Mus. 44: 130 (18). 1891. 
Pileus submembranous, convex, becoming expanded and umbilicate, 4-8 mm. broad; 
surface whitish or pale-cinereous, distantly radiate-striate: lamellae narrow, distant, at first 
arcuate and adnate, becoming truly decurrent, white: spores ellipsoid, generally containing a 
single large nucleus, 7.5 X 4: stipe subpruinose or sprinkled with mealy particles, at first 
whitish with a brown base, becoming brown with a whitish apex, short, curved, 8-16 mm. 
long. 
TYPE LOCALITY: Carollton, New York, 
Hasirat: On bark of white oak trees. 
DISTRIBUTION: Known only from the type locality. 
InLustTRATIONS: Ann. Rep. N. Y. State Mus. 44: $l. 2, f. 8-12. 
6. Omphalopsis Austini (Peck) Murrill. 
Agaricus (Omphalia) Austini Peck, Ann. Rep. N. Y. State Mus. 28: 48. 1876. 
Omphalia Austini Sacc. Syl. Fung. 5: 336. 1887. 
Pileus rather tenacious, convex or hemispheric, deeply umbilicate, sometimes perforate, 
6-12 mm. broad; surface glabrous, viscid when moist, white, margin striate: lamellae sub- 
arcuate, distant, decurrent, white: spores ellipsoid, 7.5 X 5 4: stipe glabrous, even, white, 
villose at the base, equal, hollow, 2.5-4 cm. long, 1 mm. thick. 
TYPE LOcaLity: Providence, Saratoga County, New York. 
Hasirat: On decaying wood of spruce and arbor-vitae. 
DISTRIBUTION: New York. 
7. Omphalopsis translucentipes Murrill, sp. nov. 
Pileus very thin and delicate, convex, depressed at the center, gregarious to subcespitose, 
scarcely reaching 1 cm. broad; surface glabrous, not striate, pure-white, margin entire, cou- 
colorous: lamellae simple, short-decurrent, subdistant, rather narrow, white: stipe very slender, 
cylindric, smooth, glabrous, white, subtranslucent, 2 cm. long, less than 1 mm. thick. 
Type collected on an old stump in wet woods in City Park, New Orleans, Louisiana, September 
6, 1908, F. S. Earle 72 (herb. N. Y. Bot. Gard.). 
Haprrat: Logs or stumps in wet woods. 
DISTRIBUTION: Vicinity of New Orleans, Louisiana. 
8. Omphalopsis centenaria (Berk. & Curt.) Murrill. 
Agaricus (Omphalia) centenarius Berk. & Curt. Ann. Mag. Nat. Hist. II. 12: 420. 1853. 
Omphalia centenaria Sacc. Syll. Fung. 5: 334. 1887. 
Pileus fragile, thin, conic-convex, umbonate, densely cespitose, 12 mm. broad; margin 
sulcate: lamellae long-decurrent, white: stipe spotted-annulate, whitish-hyaline, darker at the 
base, hollow, tomentose-connate below, 8-10 cm. long. 
TYPE LocaLIty: South Carolina. 
Hastirat: On rotten logs. 
DIsTRIBUTION: Known only from the type locality. 
9. Omphalopsis immaculata (Peck) Murrill. 
Agaricus (Mycena) immaculatus Peck, Ann. Rep. N. Y. State Mus. 3 
Mycena immaculate Sacc. Syll. Fung. "5: 264. Y 987. a 
Pileus membranous, conic or subhemispheric, 5-10 mm. broad; surface glabrous, pure- 
