Part 6, 1916] AGARICACEAE 421 
Agaricus monadelphus Morgan, Jour. Cinc. Soc. Nat. Hist. 6:69. 1883. 
Clitocybe monadelpha Sacc. Syll. Fung. 5: 164. 1887. 
Pleurotus caespitosus Sacc. Syll. Fung. 5: 352. 1887. 
Clitocybe aquatica Banning & Peck; Peck, Ann. Rep. N. Y. State Mus. 44: 180 (68). 1891. 
Armillaria mellea exannulata Peck, Ann. Rep. N. Y. State Mus. 46: 134 (54). 1893. 
?Chitocybe parasitica Wilcox, Bull. ‘Okla. Exp. Sta. 49:18. 1901. 
Pileus fleshy, convex, sometimes becoming centrally depressed, cespitose, 2.5-7 cm. broad; 
surface squamulose at the center, pale-brown, reddish-brown, or honey-colored; lamellae 
rather crowded, distinctly decurrent, pallid or pale-flesh-colored: spores broadly ovoid or 
slightly irregular, smooth, hyaline, 7-9 X 5-6 yu: stipe long, flexuous, fibrous, solid, often 
becoming hollow with age and twisted and tapering at the base, brown, pale-brown, or tinged 
with flesh-color, 6-10 em. long, 46 mm. thick. , 
TyP# LOCALITY: Ohio. 
Hasitat: Woods and open places. 
DisTRIBUTION: New York to Kansas and South to Alabama and British Honduras. 
IntusTRations: Ann. Rep. N. Y. State Mus. 51: pl. 51, f. 1-5; McIlv. Am. Fungi pl. 27; Jour. 
Cine. Soc. Nat. Hist. 6: pl. 4. 
3. Monadelphus illudens (Schw.) Earle, Bull. N. Y. Bot. Gard. 5: 
432. 1909. 
?A garicus olearius DC. Fl. Fr. 6:44. 1815. 
Agaricus illudens Schw. Schr. Nat. Ges. Leipzig 1: 81. 1822. 
Agaricus (Pleurotus) facifey Berk. & Curt. Ann. Mag. Nat. Hist. II. 12: 421. 1853. 
Chiocybe illudens Sace. Syll. Fung. 5: 162. 1887. 
Pileus convex or nearly plane, sometimes centrally depressed, obtuse or umbonate, ces- 
pitose, 7-12 cm. broad; surface glabrous or obscurely virgate, saffron-yellow or orange-yellow, 
margin often irregular: context white or yellowish, the odor strong, the taste disagreeable, poison- 
ous; lamellae crowded, decurrent, narrowed toward each end, concolorous, phosphorescent: 
spores globose, 4-5 yw: stipe long, firm, glabrous, solid, stuffed or rarely hollow, often attenuate 
toward the base, sometimes eccentric, concolorous or sometimes brownish toward the base, 
7-14 cm. long, 6-12 mm. thick. 
TYPE LocaALity: North Carolina. 
Hasirat: About stumps and dying trunks of deciduous and rarely coniferous trees. 
DistRiBuTION: Eastern United States and west to Kansas and Texas. 
ILLUSTRATIONS: Ann. Rep. N. Y. State Mus. 49: pl. 49; Bull. Conn. Geol. Nat. Hist. Surv. 3: 
pl. 19; Mcllv. Am. Fungi pl. 29a; Murrill, Ed. Pois. Mushr. f. 33. 
4. Monadelphus sphaerosporus (Peck) Murrill, Mycologia 7: 282. 
1915. 
Clitocybe sphaerospora Peck, Bull. Torrey Club 36: 331. 1909. 
Pileus fleshy, nearly plane, centrally depressed when old, 5.5—7 cm. broad; surface opaque, 
glabrous, brick-red, darker at the center: context tough, white, without distinct taste or 
odor; lamellae subdistant, narrowed toward each end, decurrent, white, the interspaces some- 
what venose: spores globose, 10-12 »: stipe equal, slightly radicate, solid, white, 5-6.5 cm. 
long, 1.5-2 em. thick. 
TYPE Locality: Claremont, California. 
Hasirar: Under oaks. 
DIstRiBuTION: California. 
5. Monadelphus marginatus (Peck) Murrill, Mycologia 7: 282. 
1915. 
Clitocybe marginata Peck; V. S. White, Bull. Torrey Club 29: 558. 1902. 
Pileus fleshy, rather thick, subeampanulate, becoming convex, obtuse or broadly umbonate, 
cespitose, 5~8 cm. broad; surface glabrous or nearly so, dry, bay-red verging to mahogany- 
color, margin at first involute: context yellow; lamellae narrow, crowded, decurrent, yellowish, 
reddish on the edges: spores subglobose, 5 X 4-5 wu: stipe nearly equal, stout, hollow, glabrous, 
shining, yellowish marked with reddish longitudinal lines, 5-8 cm. long, 6-12 mm. thick. 
TYPE Locality: Bar Harbor, Mt. Desert, Maine. 
Hasirat: Around decaying stumps. . 
_DIsTRIBUTION: Known only from the type locality. 
