36 NORTH AMERICAN FLORA [Volume 10 



46. ARMILLARIA (Fries) Quel. Champ. Jura Vosg. 36. 1872. 



Agaricus § Armillaria Fries, Syst. Myc. 1: 26. 1821. 



Armillariella P. Karst. Acta Soc. Faun. Fl. Fenn. 2: 4. 1881. 

 Gyrophila Quel. Ench. Fung. 9. 1886. 

 Mucidula Pat. Hymen. Eur. 95. 1887. 

 Catathelasma I^ovejoy, Bot. Gaz. 50: 383. 1910. 



Pileus fleshy, putrescent, solitary to cespitose; lamellae adnate, varying to adnexed or 

 decurrent; spores hyaline; veil usually forming an annulus; stipe central, fleshy, firm, at times 

 fibrous. 



Type species, Armillaria ramentacea (Bull.) Quel. 



Terrestrial species ; usually solitary. 



Pileus white or tinged with yellow, the disk often differently colored. 

 Spores 4-8 fx long. 



Stipe bulbous; pileus 5-10 cm. broad. I, A. appendiculata. 



Stipe not bulbous; pileus usually 10-15 cm. broad. 



Stipe viscid; spores ellipsoid, 7 .5X5 /*. 2. A. viscidipes. 



Stipe dry ; spores globose, 4—6 fi. 



Pileus white or yellowish; growing in humus. 3. A. magnivelaris. 



Pileus white with yellow center; growing in sand. 4. A. arenicola. 



Spores 10-17 ju long. 



Annulus simple, not embracing base of stipe. 



Stipe short, 2.5-5 cm. 5. A. macrospora. 



Stipe long, 5—10 cm. 6. A. ventricosa. 



Annulus embracing base of stipe like a volva. 7. A . evanescens. 



Pileus whitish to lilac-gray variegated with brown spots; spores sub- 



globose, 7 fi. 

 Pileus distinctly yellowish, yellowish -brown, or tan -colored. 

 Pileus 3,5-6 cm. broad; spores 5-9 m long. 



Surface smooth, not acutely umbonate. 9. A. albolanatipes. 



Surface squamose, acutely umbonate. 10. A. umbonata. 



Pileus 12-20 cm. broad; spores 12—14/* long. 11. A. nobilis. 



Wood-loving species; solitary to cespitose. 



Spores 15-20 /a; pileus white to gray. 12. A. alphitophylla, 



Spores 1 /x or less ; pileus not as above. 



Sporophores gregarious; pileus deep-red or chocolate-colored. 13, A. umbilicata. 



Sporophores densely cespitose; pileus honey -yellow to reddish-brown. 14. A. putrida. 



•8. A. nardosmia. 



1. Armillaria appendiculata Peck, Bull. Torrey Club 24: 140. 



1897. 



Pileus broadly convex, 5-10 cm. broad; surface glabrous, whitish, often tinged with 

 ferruginous or brownish-ferruginous on the disk; context white or whitish; lamellae close, 

 rounded behind, whitish; spores subellipsoid, 8X5 ju; stipe equal above or slightly tapering 

 upward, solid, bulbous, whitish, 4-9 cm. long, 1-2 cm. thick; veil membranous or webby, 

 white, commonly adhering in fragments to the margin of the pileus. 



Type locality: Auburn, Alabama. 



Habitat: On the ground. 



Distribution: Known only from the type locality. 



2. Armillaria viscidipes Peck, Ann. Rep. N. Y. State Mus. 44: 



128. 1892. 



Pileus fleshy, compact, convex to nearly plane, 7.5-15 cm. broad; surface soft, glabrous 

 or at times slightly innate-fibrillose, whitish with a slight yellowish or reddish-yellow tint, 

 cracking longitudinally at times; context white, odor peculiar, penetrating, subalkaline; lamellae 

 narrow, crowded, sinuate or subdecurrent, whitish; spores ellipsoid, 7.5 X5 fi,\ stipe equal, solid, 

 viscid and slightly tinged with yellow below the annulus, whitish above, 7.5-10 cm. long, 

 12-25 mm. thick; annulus narrow, membranous. 



Type locality: Rock City, Dutchess County, New York. 

 Habitat: Mixed woods. 



Distribution: Known only from the type locality. 

 Illustrations: Ann. Rep. N. Y. State Mus. 44: pi. 2,f. 1-3. 



