Part 4, 1915] AGARICACEAE 243 
13. Resupinatus atropellitus (Peck) Murrill. 
Pleurotus atropellitus Peck, Ann, Rep. N. Y. State Mus. 39:65. 1887. 
Pileus very thin, tough, flaccid, resupinate or reflexed, convex or subplane, suborbicular or 
reniform, 6-16 mm. broad; surface blackish-brown or black, with gray tomentum, villose- 
tomentose except on the margin, which is thin and slightly striate when moist: lamellae crowded, 
rather broad, blackish-brown or black, the edges white: spores subpellucid, smooth, hyaline, 
7.5-9 X4-5 yp: stipe absent, but the pileus is sometimes prolonged into ashort, grayish-tomentose 
tubercle. 
TYPE LocALity: Fort Edward, New York. 
HasiraTt: On decayed trunks of both deciduous and coniferous trees. 
DisTRIBUTION: New York, Connecticut, and Pennsylvania. 
DOUBTFUL SPECIES 
Agaricus (Pleurotus) algidus Fries, Syst. Myc. 1: 190. 1821. This European species has 
been several times reported from eastern North America. It is characterized by its glabrous, 
brown surface. Resupinaius approximans would seem to account for all the forms referred 
to this species in America. 
Agaricus (Pleuroius) mastrucatus Fries, Syst. Myc. 1: 190. 1821. This European species 
was reported several times from the eastern United States by the older collectors. Peck says 
in his 50th Annual Report that it is very rare. It is distinguished from the other species of the 
genus by its squamose pileus. 
Agaricus (Pleuropus) pelliculosus Schw. Schr. Nat. Ges. Leipzig 1:90. 1822. Described 
from North Carolina. Apparently related to R. atrocoeruleus or to some abnormal form of 
Lentinus or Panellus. 
Agaricus (Pleurotus) Racodium Berk. & Curt. Ann. Mag. Nat. Hist. III. 4: 288. 1859. 
This species was very briefly described from specimens collected on rotten wood in Pennsyl- 
vania by Michener. It is said to differ from R. applicatus in its dense covering of black hairs. 
16. MARASMIELLUS Murrill, gen. nov. 
Pileus small, irregular, membranous, reviving: lamellae adnate or adnexed: spores hyaline: 
veil none: stipe filiform, tubular, short, lateral or very eccentric, sometimes wanting. 
Type species, Marasmiellus juniperinus Murrill. 
Pileus 2-3 mm. broad. 1. M. inconspicuus. 
Pifeus 10 mm. or more broad. 
Pileus light-brown, glabrous. 2. M. juniperinus, 
Pileus purple, tomentose. 3. M. purpureus. 
1. Marasmiellus inconspicuus Murrill, sp. nov. 
Pileus eccentric, convex, usually stipitate, but varying to sessile, gregarious, 2-3 mm. 
broad: surface white, finely tomentose, margin lobed: lamellae adnate, distant, rather narrow, 
irregular, inserted, white, radiating from an eccentric or lateral point: stipe usually lateral, 
rarely eccentric, sometimes wanting, cylindric, white, fibrillose, 1-2 mm. long. 
Type collected on a dead stick, five miles east of Santiago de las Vegas, Cuba, September 11, 
1904, F. S. Earle 191 (herb. N. Y. Bot. Gard.). 
DISTRIBUTION: Known only from the type locality. 
2. Marasmiellus juniperinus Murrill, sp. nov. 
Pileus shaped like a finger nail, with a short, very eccentric stipe, firm, opaque, gregarious, 
reaching 1.5 ecm. broad; surface light-brown, glabrous, slightly sulcate, especially toward the 
margin: lamellae rather broad, firm, twice inserted, not interveined, adnate, white and sub- 
distant when young, becoming very distant and light-brown with age, the interspaces also 
changing from white to brownish: stipe almost lateral, tough, slightly enlarged upward, pruinose 
to glabrous, smooth, 1-2.5 mm. long, 0.5-1 mm. thick. 
Type collected on the bark of a living trunk of Juniperus barbadensis at Cinchona, Jamaica, 
December 25-January 8, 1908-9, W. A. & Edna L. Murrill 484 (herb. N. Y. Bot. Gard.). 
Distrisurion: Known only from the type locality. 
