372 Wisconsin Academy of Sciences, Arts, and Letters. 
Bull. 105: 24, and 131: 43). The species is reported from Ohio by 
Stover. Peck says: 
“The species has probably been confused with Lentinus lepideus 
from which it may be separated by its more slender habit, thinner 
pileus, smaller scales, more decurrent lamellae without a sinus and 
especially by its smaller spores. In our specimens there is no 
evidence of a veil.’ ’ 
In Bulletin 131 Peck adds that the dimensions of the spores of 
Lentinus lepideus as given by European authors vary enough to 
include this form. Peck gives the measurements as 4-5 x 7%-10/a. 
In our collections of L. lepideus the spores are often no larger 
than this. Murrill gives a wide range of size to the spores of L. 
lepideus, 3-6 x 7-15/a. Peck’s description of L. spretus reads: 
“Pileus thin, tough, convex, becoming nearly plane, obtuse or 
umbonate, rimose-squamulose, grayish brown or pale alutaceous, 
sometimes more highly colored in the center. Flesh white. 
Lamellae close, rather narrow, decurrent, whitish, serrate-dentate 
on the edges, sometimes lacerate. Stem equal or sometimes nar¬ 
rowed toward the base, sometimes thickened, solid, subsquamose, 
often eccentric, whitish, often brownish toward the base. Spores 
white, oblong, 4-5 x 7%-10/a. 
“Pileus 2-5 inches broad, stem 1-3 inches long, 3-6 lines thick. 
Decaying wood of pine and railroad ties. July to September.” 
Note. L. spretus has much in common with L. hornotinus Fr. That 
species is said to be villous-pulverulent rather than scaly. The spores 
are 3 x 10-12/a. It is illustrated by Britzelmayr 522.3. It is quite, likely, 
however, that L. hornotinus belongs to the Lentinus adhaerens group. 
4. Plate XV, B. A form with obconic pileus, long decurrent 
lamellae and slender, somewhat scaly stem. This is Lentinus ob- 
conicus Pk. The photograph was made from plants of the type 
collection loaned to me by Dr. Whetstone. They were found in a 
lumber yard, but the exact position was not noted. They evi¬ 
dently grew from some crevice in the timber. The loose strands 
of mycelium, composed of hyphae 4 /a in diameter, which make up 
the sporophore, the club-shaped basidia 4-6 x 20-30/a, and the 
spores A- 5 x 8-10/a are all characteristic of L. lepideus . It is an ex¬ 
treme form of the nature of L. spretus. The species has been found 
but once. Peck’s description (Bull. Torrey Bot. Club 33: 215) 
reads: 
