Part 1, 1914] AGARICACEAE 37 



3. Armillaria magnivelaris (Peck) Murrill. 



Agaricus (Armillaria) ponderosus Peck., Bull. Buffalo Soc. Nat. Sci. 1: 42. 1873. Not A. 



ponderosus Pers. 1801. ( 



Agaricus magnivelaris Peck, Ann. Rep. N. Y. State Mus. 29; 66. 1878. 

 Armillaria ponderosa Sacc. Syll. Fung. 5: 78. 1887. 



Pileus thick, compact, convex or subcampanulate, 10-13 cm. broad; surface smooth, white 

 or yellowish, margin naked or clothed with the appendiculate veil, strongly involute; context 

 white ; lamellae crowded, narrow, slightly emarginate, white inclining to cream-colored ; spores 

 nearly globose, 4/a; stipe stout, subequal, firm, solid, coated by the veil, concolorous, white 

 and furfuraceous above the annulus, 10-13 cm. long, 2.5 cm. thick; veil slightly viscid, long 

 persistent, at length lacerate, adhering in shreds to the margin and the stipe. 



Type locality: Copake, New York. 

 Habitat : On the ground in woods. 

 Distribution: New York and New England. 



4. Armillaria arenicola Murrill, Mycologia 4: 212. 1912. 



■ 



Pileus firm, fleshy, convex to subplane or slightly depressed, gibbous, gregarious, 12-15 

 cm. broad; surface dry, smooth, glabrous, white or whitish, cremeous at the center; context 

 coarse, white, tasteless ; lamellae adnate, becoming sinuate-adnexed or nearly free, ventricose, 

 plane, close, white, changing to rust-colored when bruised; spores globose, smooth, hyaline, 

 4-6 n; stipe equal or tapering downward, dry, smooth below, somewhat scaly above the annulus, 

 white tinged with cremeous, 12 cm. long, 3 cm. thick; annulus ample, persistent, membranous, 

 white, attached just above the middle of the stipe. 



Type locality: Newport, Oregon. 

 Habitat : In sand-hills among scrubby pines. 

 Distribution: Known only from the type locality. 



5. Armillaria macrospora Peck, Bull. Torrey Club 27: 610. 



1900. 



Pileus fleshy, fragile, convex, solitary or cespitose, 5-20 cm. broad; surface glabrous, 

 viscid when moist, shining when dry, white, sometimes brown in the center; context white; 

 lamellae rather narrow, close, decurrent, white; spores oblong or subfusiform, 12-15X6-8/*; 

 stipe short, stout, subequal, white, 2.5-5 cm. long, 1.2-2 cm. thick; annulus thick, white. 



Type locality: Colorado. 



Habitat: Dense spruce woods. 



Distribution: Known only from the type locality. 



6. Armillaria ventricosa Peck, Bull. Torrey Club 34: 104. 



1907. 



Lentinus ventricosus Peck, Bull. Torrey Club 23: 414. 1896. 



Pileus fleshy, convex or nearly plane above, 8-15 cm. broad; surface glabrous, shining, 

 white, margin thin, involute; context white or whitish; lamellae narrow, close, decurrent, 

 sometimes dentate or denticulate on the edges, whitish; spores 10-12X5-6 m; stipe short, thick, 

 ventricose, solid or sometimes hollow through erosion by insects, abruptly narrowed at the 

 base, annulate, white or whitish, 5-10 cm. long, 1.5-2.5 cm. thick. 



Type locality: Tacoma Park, Washington, D. C. 

 Habitat: On the ground in pine woods. 

 Distribution : Alabama and District of Columbia. 



7. Armillaria evanescens (Lovejoy) Murrill. 



Catathelasma evanescens Lovejoy, Bot. Gaz. 50: 384. 1910. 



Pileus broadly convex to nearly plane, solitary, 13 cm. broad; surface smooth, damp, 

 white, deep-cream in the center, becoming rich-ocher with a reddish tint when dried, margin 

 entire; context whitish, compact, thick at the center, thinner near the margin; lamellae very 

 decurrent, short ones intermixed with long ones, white, 2-3 cm. wide near the margin of the 



