203 
Sept. 1905] North American Species of Marasmius 
5. MARASMIUS UMBONATUS Peck 25TH N. Y. Rep. 
1872. 
Pileus thin, tough, expanded, umbonate, glabrous, even or 
substriate, alutaceous. Stipe solid, equal, tawny below, paler 
above, velvety-tomentose. Lamellae narrow, subdistant, reaching 
the stipe, venose, connected, sometimes branched, white. 
Growing on the ground under balsam trees. Pileus 1-2 cm. 
in diameter; the stipe 2.5-4.0 cm. in length and 1 mm. thick. 
6. MARASMIUS ACERINUS Peck, N. Y. Rep. 1898. 
Pileus thin, submembranaceous, convex, umbilicate, subgla- 
brous, sulcate-striate, pale bay red. Stipe short, often curved, 
hollow, clothed with minute whitish pubescence, colored like the 
pileus or sometimes a little darker. Lamellae broad, distant, 
adnate, white or yellowish; spores subelliptic, 7-8 x 4 mic., 
obliquely apiculate at one end. 
Growing on old bark of Acer spicatum. Pileus 6-12 mm. 
broad; the stipe 1-2 cm. long, 1-2 mm. thick. The stipe is thinly 
clothed with minute short whitish hairs, which appear to some 
extent on the pileus. 
7. MARASMIUS VITICOLA B. & C. Ann. & Mag. N. H. 
Oct. 1859. 
Pileus thin, subcoriaceous, depressed, sulcate-striate, pale 
rufous. Stipe short, dark brown, pruinose-furfuraceous. Lamel¬ 
lae ventricose, moderately broad, slightly adnate, distant, pallid, 
the interstices even. 
Growing on dead vine branches; Alabama. Pileus 2 cm. in 
diameter; the stipe 2.5 cm. in height. 
b. Lamellae rather close. 
8. MARASMIUS SPONGIOSUS B. & C. Journ. Bot. 
1849. 
Pileus plane, whitish-brown, the center darker, obtuse. Stipe 
furfuraceous-pulverulent; the base thickened, spongy, tawny- 
villous. Lamellae broad, whitish, rather close, slightly adnate; 
spores elliptic, obliquely apiculate, 7-9 x 3-4 mic. 
Growing in rich soil around old stumps, etc. Pileus 1-2 cm. 
in diameter, the stipe 3-5 cm. long, and 1-2 cm. thick above the 
rooting base, sometimes much thicker. 
9. MARASMIUS RIGIDUS Montagne Syll. Crypt. 
1856. 
Pileus a little fleshy, convex, umbonate then explanate, at 
length cyathiform-reflexed, glabrous, purplish, brown when dry, 
the margin striate. Stipe cartilaginous, bay, fistulous, every¬ 
where clothed by a pale villosity, the base thickened and spongy- 
floccose. Lamellae close, narrow, attenuate-attached behind, 
white, pale cervine when dry. 
