66 [ ASSEMBLY 
prolonged at the base into a short grayish-tomentose stem, dlackish- 
brown or black, the tomentum grayish or cinereous, the thin margin 
slightly striate when moist; lamellz rather broad, close, blackish-brown 
or black, whitish on the edge; spores swbelliptical; .0003 to .00035 
in. long, .00016 to .0002 broad. 
Decaying wood and bark, both of frondose and acerose trees. Fort 
Edward, #. C. Howe. Buffalo. G. W. Clinton. Maryland, Helder- 
berg and Adirondack mountains. June to October. 
Our plant is closely related to Pleurotus applicatus, and it is with 
some hesitation that I have described it as distinct. But unless the 
figures and descriptions of that species are erroneous, our fungus is 
- easily distinguished from it by its larger size, darker color and closer 
blackish lamelle. P. applicatus is described as dark cinereous, cupu- 
lar, two to three lines broad, villose at the base, sessile or attached by 
a prolongation on the back and with the lamellz distant and paler 
than the pileus. In the American plant these characters do not hold 
good. The pileus is often clearly attached by a lateral stem or stem- 
like base and the villosity is found everywhere except on the margin, 
and the lamelle are always, so far as I have seen, as dark as or eyen 
blacker than the pileus. The plant is flexible and revives on the ap- 
plication of moisture, thus indicating an affinity with the genus 
Panus. I haye seen no description of the spores of P. applicatus. 
Pleurotus niger, Schw 
Black Agaric. 
Pileus submembranous, two to four lines broad, subresupinate, pul- 
veraceous, black, plicate on the margin ; lamelle broad, radiating, black, 
cinereous on the edge; spores subglobose, .0002 to .00025 in. broad. 
Decaying wood. Helderberg mountains, June. This apparently 
rare fungus has been found in our State but once. The pileus is at- 
tached by a tuft of black hairs, and in the largest specimens these ex- 
tend to the disk and there have a pulverulent appearance. The black 
color, black villosity and more coarsely striate or plicate margin dis- 
tinguish this species from the next, which it otherwise closely resem- 
bles. 
Pleurotus striatulus, /’7. 
Slightly-striate Agaric. » 
Agaricus membranaceus, Scop. Agaricus striato-pellucidus, Pers. 
Pileus membranous, very delicate, two to four lines broad, resupin- 
ate or subcupular, then reflexed, sometimes obconic and pendulous, 
sessile, slightly striate when moist, strongly striate or corrugated when 
dry, flaccid, glabrous, scattered or gregarious, persistent, cinereous 
or brown; \amelle few, distant, whitish or cinercous; spores subglo- 
bose, .0002 to .00025 in. broad. 
Much decayed wood of pine and hemlock. Fort Edward. #. C. 
Howe. Buffalo. G. W. Clinton. Greenbush and Adirondack moun- 
tains. July and October, 
This is the smallest of our Pleuroti. Like the three preceding 
species, it revives on the application of moisture, and with them it 
forms a peculiar group worthy of distinction and separation from the 
