No. 104.] 65 
: 
white color, sessile pileus, and its Jamelle forking or even anastomos- 
ing near the base in large specimens. 
I find no good characters by Which to distinguish Agaricus nephre- 
tus, Ellis, from this fungus. The spores in this, as well as in P, stria- 
tulus, P. niger and some others, have a slight depression on one side, 
which makes them broader in one diameter than in the other, and 
gives them a slightly curved appearance when viewed edgewise. 
Pleurotus septicus, /’. 
Wood-rotting Agaric. Thin Pleurotus. 
Agaricus pubescens, Sow. 
Pileus smail, thin, three to six lines broad, nearly plane, pubescent 
or subpulverulent, sessile or with a short white pubescent stem or 
stem-like base, pure white; lamelle rather broad, subdistant, white ; 
spores subglobose, .00016 to .0002 in. broad. 
Decaying wood. Ballston and Adirondack mountains. August. 
The clear white color of P. porrigens is seen also in this species, 
which may be easily distinguished by its smaller size, nearly pubescent 
pileus, subdistant lamellx and smaller spores. 
Pleurotus atroceruleus, /’7. 
Dark-blue Agaric. Blue-black Pleurotus. 
Agaricus alneus, Scheff. 
Pileus fleshy with an upper brownish gelatinous stratum, one to two 
inches broad, convex or nearly plane, reniform dimidiate or obovate, 
rather tough and flexible, sometimes czspitosely imbricated, sessile, 
villose-tomentose, dark-blue, blackish, grayish or tawny-brown, flesh 
soft, whitish ; lameliz rather broad, close, whitish or yellowish ; spores 
elliptical, .00025 to .0003 in. long, .00016 to .0002 broad. 
Decaying trunks and branches of beech, alders and ee Kar- 
ner. September. Buffalo. G. W. Clinton. 
I have seen no American specimens with the dark-blue or indigo 
color shown in the published figures of the European plant, but Fries 
himself says that the pileus is sometimes brown, so that we have no 
doubt of the specific identity of our plant. The pileus is covered 
with a grayish or cinereous villosity, which in small specimens forms 
a thin uniform velvety pubescence, but in large specimens it is more 
dense and somewhat tufted. Sometimes it is much thinner on the 
margin than toward the base of the pileus, and in such specimens the 
real color of the pileus is best seen on the margin. This, in large 
specimens, is often wavy or somewhat lobed. Small, blackish forms 
frequently resemble large forms of the next species, but are dis- 
tinguishable by the paler color of the lamellz. ‘The plant readily 
revives on the application of moisture. 
Pleurotus atropellitus, 7. sp. 
Black-skinned Agaric. 
Pileus very thin, three to eight lines broad, rather tough, flaccid, 
resupinate or reflexed and lateral, convex or nearly plane, suborbicular 
obovate or reniform, villose-tomentose except on the margin, sessile or 
[Assem. Doc. No, 104.] 9 
