No. 104.] 61 
Pileus 2 to3 in. broad, stem 1 to 2 in. long, 2 to 4 lines thick. 
_ Decaying wood. Griffins, Delaware county, September. 
Our specimens, by their pure white color, emarginate adnexed lamelle 
and glabrous stem, did not well agree with the published description 
of P. lignatilis, and they were, therefore, described in the Thirty-first 
Report as a distinct species. But P. lignatilis is very variable accord- 
ing to Fries, and as our plant is scarcely more than a variety of it we 
have united it thereto. 
Pleurotus subareolatus, Pk. 
Shghtly-areolate Agaric. 
Pileus compact, convex, whitish tinged with brownish pink, usually 
cracking in small maculiform areas; lamelle rather broad, loose, 
decurrent, whitish becoming tinged with yellow in drying; stem 
eccentric, subvertical, short, curved, firm, solid, sometimes com- 
pressed, white; spores oblong, .0005 to .0006 in. long, about .0002 
broad. 
Pileus 3 to 4 in. broad, stem 6 to 12 lines long, 4 to 6 lines thick. 
Trunks of elm trees. Bethlehem. October. 
This plant has occurred with us but once. It differs from P. tessu- 
latus by its stroagly decurrent lamelle which form slightly elevated 
lines far down on the stem. 
Pleurotus sapidus, Kalchd. 
Sapid Agaric. 
Plant generally cespitose; pileus eccentric or lateral, rarely sessile, 
irregular, convex or depressed on the disk, glabrous, variable in 
color, whitish, yellowish, grayish-brown, lilac-brown or smoky- 
brown, flesh white ; Jamelle rather broad, subdistant, decurrent, dis- 
tinct or anastomosing at the base, whitish; stem firm, solid, straight 
or curved, white or whitish, often united at the base; spores oblong, 
pale lilac, .00035 to .00045 in. long, .00016 to .0002 broad. 
Pileus 2 to 5 in. broad, stem 1 to 2 in. long, 3 to 8 lines thick. 
Decaying wood of elm, beech, birch, horse-chestnut, etc., sometimes 
on buried sticks. Common. June to November. Kdible. 
This is a very variable species, closely allied to P. ostreatus, with 
which it is sometimes confused, and from which its short-stemmed 
subsessile forms with anastomosing lamelle can scarcely be distin- 
guished except by the peculiar color of the spores. These, when caught 
on white paper, have a dull, pale-lilac hue, inclining to lavender color, 
If they fall on a dark or brown surface they appear whitish. By reason 
of the colored spores of this fungus and of P. ewosmus, W. G. Smith 
proposed the transfer of these plants to Claudopus, but this arrange- 
ment was not adopted by Fries, because their real affinities were evi- 
dently with the Pleuroti. He says that the species is so variable that 
its characters are indicated with difficulty, and that on the same trunk 
Specimens sometimes occur that are white, tawny-brown and umber. 
In the typical form, the lamellae are not described as anastomosing, 
but a form is mentioned in which the stem is reticulated by anasto- 
mosing veins. In our plant the lamelle frequently anastomose at the 
base, just as in P. ostreatus. Its stem, also, is sometimes as short or 
obsolete as in that species. It occurs both in woods and in open 
