322 NORTH AMERICAN FLORA [VoLumE 9 
III. SPECIES OCCURRING IN TROPICAL NorTH AMERICA 
Pileus white, whitish, or cinereous, sometimes differently colored on 
the disk. 
Surface entirely white. 
Pileus minute, 1-4 mm. broad. 
Stipe short, 4-6 mm. 88. P. Myrciae. 
Stipe much longer, 1-2.5 em. 
Pileus 2 mm. broad, not striate. 89. P. alphitophorus. 
Pileus 4 mm. broad, striate. 90, P. subpulverulentus. 
Pileus much larger, 1.5-2 cm. broad. 91. P. trojanus. 
Surface white, fuscous on the umbo. 92. P. roridulus, 
Surface cinereous, pale-avellaneous on the umbo. 93. P. margarita. 
Pileus and lamellae greenish-gray. 94. P. viridigriseus. 
Pileus yellowish, avellaneous, or brownish. 
Pileus 4-8 mm. broad. 
Stipe 2 em. long. 
Pileus solitary or gregarious, striate. : : 
Surface pale-avellaneous, ashy-white on the disk. 95. P. cinereiavellaneus. 
Surface avellaneous, with a fumosous tint, the disk con- 
colorous. 96. P. fumosiavellaneus, 
Pileus cespitose, not striate. 97. P. avellaneigriseus. 
Stipe 5-7 cm. long. 98. P. gracillipes. 
Pileus about 1 cm. broad. i 
Surface avellaneous, striate. 99. P. argillaceus. 
Surface dark-brown, not striate. 100. P. pubescens. _ 
Pileus 1.5-2 em. broad. 
Surface pale-isabelline or avellaneous. 101. P. cinchonensis. 
Surface ochraceous-brown. 102. P. carbonicola. 
Pileus lilac or some shade of red. 
Pileus 5-8 mm. broad. 
Surface lilac-colored. 103. P. syringeus. 
Surface dark-testaceous. 104. P. testaceus. 
Pileus 1-2 cm. broad; stipe 2-3 cm. long. 
Surface latericeous; lamellae testaceous. 105. P. latericius. 
Surface chestnut-red; lamellae fawn-colored. 106. P. corrugatus. 
Pileus 2-5 cm. broad; stipe 5-8 cm. long. a P. purus, 
1. Prunulus lepiotiformis Murrill, sp. nov. 
Pileus minute, broadly convex, not fully expanding, solitary, 3 mm. broad; surface dry 
smooth, white, minutely and densely pubescent-scaly, margin entire, concolorous: lamellae 
subdistant, rather broad, inserted, adnexed to nearly free, white to pale-yellowish: stipe short, 
filiform, smooth, white above, grayish-brown and whitish-pubescent below, 7 mm. long. 
Type collected on much decayed hemlock wood in woods at Unaka Springs, Tennessee, August 
18-24, 1904, W. A. Murrill 716 (berb. N. Y. Bot. Gard.). 
DISTRIBUTION: Known only from the type locality. 
2. Prunulus tenerrimus (Berk.) Murrill. 
Agaricus (Mycena) tenerrimus Berk. in Smith, Engl. Fl. 5°: 61. 1836. 
Mycena tenerrima Quél. Champ. Jura Vosg. 75. 1872. 
Pileus thin, delicate, flaccid, globose to convex, gregarious, 2-4 mm. broad; surface pure- 
white, densely furfuraceous: lamellae free, subremote, ventricose, distant, white: spores glo- 
bose, hyaline: stipe capillary, white, at first clothed like the pileus but becoming subglabrous 
in part, discoid at the base, 2.5 cm. long, scarcely 1 mm. thick. 
Type Locatity: England. 
HasiraT: On pine cones and among pine needles. 
DIstTRIsuTION: New York; also in Europe. 
3. Prunulus crystallinus (Peck) Murrill. 
Mycena crystallina Peck, Ann. Rep. N. Y. State Mus. 41: 63. 1888. 
Pileus membranous, conic to subplane, slightly umbonate, 6-12 mm. broad; surface beset 
with yellow, viscid particles, white, margin reflexed, even or obscurely striate: lamellae adnate, 
crowded, narrow, thin, white: stipe short, slender, concolorous, adorned like the pileus, hollow, 
white-lanate at the base, 8-15 mm. long. 
TypE Locality: Catskill Mountains, New York. 
Hasirat: Fallen pine needles. 
DisTRIBUTION: Known only from the type locality. 
