314 NORTH AMERICAN FLORA [VoLUME 9 
14. Omphalopsis fibula (Bull.) Murrill. 
Agaricus fibula Bull. Herb. Fr. pl. 186. 1783. 
Omphalia Swartzii Peck, Ann. Rep. N. Y. State Mus. 45: 40. 1893. 
Pileus membranous, commonly convex or hemispheric and umbilicate, rarely conic, 3-20 
mm. broad; surface glabrous, hygrophanous, striatulate when moist and varying in color from 
orange to pale-yellow, sometimes with darker center, even and paler when dry: lamellae 
distant, arcuate, strongly decurrent, white or yellowish: spores ellipsoid, smooth, 4-6 X 2-3 y; 
cystidia 35-40 X 7-8 y: stipe long, slender, subconcolorous, glabrous, 2.5-5 cm. long, 0.5-2 
mim. thick. 
TYPE LOCALITY: France. 
Hasrrat: On mossy ground and prostrate mossy trunks of trees in woods or open places. 
DISTRIBUTION: Canada to the West Indies and Honduras and west to Colorado; also in Europe. 
ILLUSTRATIONS: Bull. Herb. Fr. pl. 186, pl. 550, f. 1; Cooke, Brit. Fungi pl. 274 (265) B; Hard, 
Mushrooms f. 99; Sow. Engl. Fungi pl. 45. 
15. Omphalopsis olivaria (Peck) Murrill. 
Agaricus (Omphalia) olivarius Peck, Bull. Buffalo Soc. Nat. Sci. 1: 48. 1873. 
Ombhalia olivaria Sacc. Syll. Fung. 5: 335. 1887. 
Pileus convex, umbilicate, 2.5 em. broad; surface glabrous, olive-green: lamellae sub- 
distant, arcuate-decurrent, pale-yellow: spores stubglobose or broadly ellipsoid, 6-7 X 54: 
stipe equal, short, glabrous, colored like the pileus, hollow, 2.5 cm. long, 2 mm. thick. 
TYPE LocaLity: North Elba, New York. 
Hasirat: On burnt ground under balsam fir trees. 
DISTRIBUTION: Known only from the type locality. 
16. Omphalopsis serotina (Peck) Murrill. 
Omphalia serotina Peck, Bull. Torrey Club 34: 98, 1907. 
Pileus submembranous, convex, sometimes slightly depressed at the center or subumbili- 
cate, 1-2 cm. bfoad; surface grayish-brown, grayish-white, or subcinereous, margin widely 
striate when fresh and moist, slightly striate when dry: lamellae rather broad, subdistant, 
adnate or slightly decurrent, white: spores narrowly ellipsoid, 8-10 X 4-5 u: stipe slender, 
hollow, glabrous, slightly villose-tomentose at the base, pallid, 1.5-2.5 cm. long, 1 mm. thick. 
Tyre LOCALITY: Boston, Massachusetts. 
Hasitat: Among fallen leaves in woods. 
DISTRIBUTION: Known only from the type locality. 
17. Omphalopsis praedecurrens Murrill. 
Mycena praedecurrens Murrill, Mycologia 4: 165, 1912, 
Pileus conic to subturbinate when young, then umbonate, and at length nearly plane, 
densely gregarious to subcespitose, reaching 1.5 cm. broad and nearly 1 cm. high; surface 
glabrous, very slightly viscid when wet, avellaneous, with darker avellaneous umbo; margin 
straight, appressed, usually striate, often yellowish-white: lamellae long decurrent, distant, 
nearly plane, inserted, entire, white with an ashy tint, acute at each end: spores ovoid, 
smooth, hyaline, 5X3-3.5 mu: stipe enlarged at the apex, subglabrous, gelatinous-white, 
avellaneous at the base, slightly viscid when wet, stuffed, about 4m. long and 2 mm. thick. 
Type LocaLity: The Bronx, New York City. 
Haprtat: On a mossy bank filled with slender roots in moist, deciduous woods. 
Distrreution: Known only from the type.locality. 
18. Omphalopsis pseudogrisea Murrill, sp. nov. 
Pileus convex-depressed, gregarious, 1-2 cm. broad; surface glabrous, smooth, subhy- 
grophanous, fuliginous, paler when dry, margin concolorous, faintly striate, appressed when 
young: lamellae inserted, not forking, decurrent, distant, broad, arcuate to plane, pallid: 
spores ovoid, pointed at one end, smooth, hyaline, uniguttulate, 6-8 X 4 yu: stipe cylindric, 
smooth, glabrous, subconcolorous, apparently solid, 3-4 cm. long, 1-2 mm. thick. 
Type collected on a rotten stump at Englewood, New Jersey, August 22, 190 1911 
(herb. N. ¥. Bot. Gard.). - i a ae i des 
DISTRIBUTION: New Jersey and southern New York. 
