332 NORTH AMERICAN FLORA [VoLuME 9 
ellipsoid or ovoid, smooth, hyaline, copious, 8-9 X 6 u: stipe slender, equal, smooth, glabrous, 
polished, hollow, subconcolorous, blackish and tomentose at the base, 3-5 cm. long, 1-2 mm. 
thick. 
Type collected in leaf-mold under spruce trees at Lake Placid, Adirondack Mountains, New 
York, October 3-14, 1912, W. A. & Edna L. Murrill 801 (herb. N. Y. Bot. Gard.). 
DisrriutTion: Adironack Mountains, New York. 
52. Prunulus denticulatus (Bolt.) S. F. Gray, Nat. Arr. Brit. Pl. 
1: 630. 1821. 
Agaricus denticulatus Bolt. Hist. Fung. 1: 4. 1788. 
Agaricus pelianthinus Fries, Syst. Myc. 1: 112. 1821. 
Mycena denticulata Quél. Fl. Myc. 223. 1888. 
Pileus subfleshy, convex-expanded, obtuse, 2.5-6 cm. broad; surface moist, hygrophanous, 
livid-purple, margin striate: lamellae elegantly reticulate-connected, emarginate-adnexed, 
blackish-violet, black and dentate on the edges: spores ellipsoid, smooth, hyaline, 5-7 K 34 u: 
eystidia containing violet-colored sap: stipe firm, equal, fibrillate-striate at the apex, paler 
than the pileus, 6-8 cm. long, 3-5 mm. thick. 
TYPE LOCALITY: Halifax, England. 
Hasirat: On the ground in woods. 
DISTRIBUTION: Northern New York; also in Europe. 
ILLUSTRATIONS: Bolt. Hist. Fung. 1: pl. 4; Boud. Ic. Myc. 1: pl. 67. 
53. Prunulus purus (Pers.) Murrill. 
Agaricus purus Pers. Tent. Disp. Fung. 21. 1797. 
Mycena pura Quél. Champ. Jura Vosg. 68. 1872. 
Pileus fleshy, thin, campanulate or convex to expanded, obtusely umbonate when young, 
2-5 cm. broad; surface smooth, glabrous, of uniform color, varying from rose to rose-purple, 
violet, or lilac, margin striate, upturned with age: lamellae rather broad, adnate to sinuate, 
sometimes wavy and crenate on the edges, venose-connected, varying from white to shades of 
rose or violet, sometimes white on the edges: spores oblong, hyaline, 7~9 & 3-3.5 mw; cystidia 
subcylindric, 30-40 * 13-15 yw: stipe firm, smooth, subglabrous, concolorous, hollow, somewhat 
villose at the base, 5~8 em. long, 2-4 mui. thick, 
‘TYPE LOCALITY: Europe. 
Hasirat: On the ground in woods. 
DistRIBuTION: Throughout temperate North America and at Jalapa, Mexico; also in Europe. 
InLustrations: Bull. Herb. Fr. pl. 507; Hussey, Ill. Brit. Myc. 2: pl. 49; Mycologia 7: pl. 158, 
f. 3; Sow. Engl. Fungi pl. 72. 
54. Prunulus adirondackensis Murrill, sp. nov. 
Pileus convex, not fully expanding, umbonate, especially when young, 2-3 cm. broad; 
surface dry, glabrous, striate-sulcate, white with a pale-avellaneous tint, margin very thin, 
white, splitting with age: lamellae adnate with a decurrent tooth, rather narrow, crowded, 
white: spores broadly ellipsoid, smooth, hyaline, 7-8.5 X 6-7 u: stipe cylindric, equal, hollow, 
slightly darker than the pileus, especially below, smooth, glabrous, polished, whitish-mycelioid 
and often long-radicate below, 4-10 cm. long, 2-3 mm. thick. 
Type collected on a dead maple log at Lake Placid, Adirondack Mountains, New York i 
17-29, 1912, W. A. & Edna L. Murvill § (herb. N. Y. Bot. Gard.). Gee eee 
Hasitat: On dead deciduous and coniferous logs in woods. 
DISTRIBUTION: Adirondack Mountains, New York. 
55. Prunulus niveipes Murrill, sp. nov. 
Pileus conic to campanulate, not fully expanding, neither umbonate nor depressed, 
gregarious, 2 cm. broad; surface moist, glabrous, striate, white with an avellaneous tint, 
margin white, entire: lamellae adnate, of medium breadth and distance, white: spores ovoid, 
smooth, hyaline, 7-9 X 5-6 py: stipe cylindric, equal, smooth, glabrous, hollow, snow-white 
throughout, slightly whitish-tomentose at the base, 4 cm. long, 2.5 mm. thick. 
Type collected among delicate mosses on a wet maple log at Lake Placid Adi ondack Moun- 
tains, New Vork, July 17-29, 1912, W. A. & Edna L. Murrill 178 (herb. N. Vv. Bot. Gard.). 
DISTRIBUTION: Known only from the type locality. 
