Part 5, 1916] AGARICACEAE 807 
30. MICROMPHALE (Nees) S. F. Gray, Nat. Arr. Brit. Pl. 1: 622. 
1821. 
Pileus fleshy, putrescent, flabelliform to subcircular in outline: lamellae adnate or sinuate: 
spores hyaline, sometimes becoming lilac-tinted: stipe more or less eccentric, solid: veil none. 
Type species, Agaricus fimbriatus Bolt. 
Species occurring in temperate North America. 
Lamellae narrow. 
Odor distinctly farinaceous; stipe 2.5-5 cm. long. l. M. abscondens. 
Odor not farinaceous; stipe 5-15 cm. long. 2. M. elongatipes. 
Lamellae broad; pileus 7.5-15 cm. broad. 3. M. ulmarium. 
Species occurring in tropical North America. 
Surface conspicuously fibrillose. 4. M. fulvifibrillosum. 
Surface glabrous or pulverulent. 
Surface white. 5. M. subexcavatum. 
Surface bay. 6. M. badium. 
Surface pale-fuscous; lamellae narrow. 7. M. brunnescens. 
Surface fuscous to blackish; lamellae broad. 8. M. fuscifrons. 
1. Micromphale abscondens (Peck) Murrill. 
Agaricus abscondens Peck, Ann. Rep. N. Y. State Mus. 31: 32. 1879, 
Pleurotus abscondens Sacc. Syll. Fung. 5: 346, 1887. 
Pileus compact, convex, sometimes slightly depressed at the center, 2.5-7.5 cm. broad; 
surface dry, glabrous, white: context having a distinct, farinaceous odor; lamellae thin, narrow, 
crowded, emarginate, white: spores minute, broadly ellipsoid, usually having a.shining nucleus, 
5 w long: stipe eccentric, unequal, rather slender, curved, whitish, slightly mealy at the apex, 
stuffed or hollow, 2.5-7 cm. long, 4-6 mm. thick, sometimes wanting. 
TYPE LOCALITY: Griffins, New York. 
Hasitrat: Decaying deciduous wood, usually in hollow stumps or logs. 
DISTRIBUTION: Canada to Ohio and west to Michigan; probably also in Europe. 
InwustRaTIon: Hard, Mushrooms f. 126. 
2. Micromphale elongatipes (Peck) Murrill. 
Pleurotus elongatipes Peck, Jour. Myc. 14: 1. 1908. 
Pileus fleshy but thin, convex or nearly plane, 5-10 cm. broad; surface glabrous, white, 
margin even: context: white, somewhat bitter; lamellae thin, crowded, rounded behind, sinuate 
or adnexed, white: spores globose, 4 uw: stipe very long, solid or stuffed, often more or less curved 
or flexuous, usually eccentric, ventricose, glabrous or slightly pruinose at the apex, more or 
less tomentose toward the base, 5-15 em. long, 6-10 mm. thick. 
Tyre Locatity: Detroit, Michigan. . 
Hasirat: On elm stumps and decaying wood in woods. 
DistRIBuTION: Michigan and Minnesota. 
3. Micromphale ulmarium (Bull.) Murrill. 
Agaricus ulmarius Bull. Herb. Fr. pl. 510. 1790. 
Pleurotus ulmarius Quél. Champ. Jura Vosg.77. 1872. 
Pileus fleshy, compact, convex or nearly plane, 7.5-15 cm. broad; surface glabrous, moist, 
sometimes tinged with reddish, yellowish, or brownish hues and marbled with livid spots, 
becoming darker and shining when old: context pure-white; lamellae broad, emarginate or 
rounded behind, adnexed, moderately close, white or whitish: spores globose, smooth, hyaline, 
becoming slightly salmon-tinted, 5-6 u: stipe stout, solid, straight or curved, glabrous or 
partly or wholly tomentose, whitish, 2.5—7.5 cm. long, 12-20 mm. thick. 
TYPE LOCALITY: France. 
Hasitat: Trunks of deciduous trees, especially elm, often emerging from pruning wounds. 
DISTRIBUTION: Canada to Virginia and west to Iowa and Kansas; also in Europe. 
Inzustrations: Bull. Herb. Fr. pl. 510; Ann. Rep. N. Y¥. State Mus. 48: pl. 26, f. 1-4; Atk. 
Stud. Am. Fungi f. 102, 103; Gibson, Edible Toadst. pl. 15; Hard, Mushr. Book f. 119; Cooke, 
ree Pie pl. 227 7D; Sow. Engl. Fungi pl. 67, pl. 248, f. 2 Richon & Roze, Atl. Champ. pl. 46, 
4. Micromphale fulvifibrillosum Murrill, sp. nov. 
Pileus fleshy, convex, dimidiate, solitary, 1-2 cm. broad; surface isabelline, with con- 
spicuous imbricate tufts of tawny fibrils, margin entire, concolorous: lamellae adnate, of medium 
