Harper—Species of Lentinus m Great Lakes Region. 381 
Pileus/ about 1 inch broad, dimidiate and sessile or with a short 
lateral stem, reniform, single or imbricated, tough, pliant, smooth, 
even, fimbriate or lacerate and wavy on the margin, fulvous be¬ 
coming paler on drying. Lamellae broad, subdistant, lacerate, 
pallid or whitish. Stem short or none, concolorous or darker than 
the pileus, smooth. Spores subglobose or broadly elliptical, 4-6/a 
in diameter. On logs, trunks, or buried sticks. 
Note 1. Fries reports a still smaller dimidiate form which grows on 
stems of herbs. 
Note 2. L. piceinus Pk. (N. Y. Mus. Bull. 150: 313), differs from the 
plants shown in Plate XXIV only in the fewer and more distant lamellae. 
The description given by Peck is as follows: 
“Pileus thin, dimidiate, sessile or with a very short stem, broadly con¬ 
vex or nearly plane, glabrous, pale alutaceous. Lamellae few, distant, 
unequal, serrate-dentate, pallid. Stem when present very short. Spores 
minute, subglobose, 4-5/a in diameter. 
“Pileus 8-12 mm. broad, stem about 2 mm. long. Bark of red spruce 
(Picea rubra (Du Roy) Dietr.) A small and rare species. Found but 
once.” 
Murrill considers it the same as Lentinus cochleatus. 
3. Plate XXV. A central-stemmed form with the stem grooved. 
Forms like those illustrated in Plate XXV growing singly with 
central grooved stems, broadly umbilicate often pervious pilei, 
and more or less brown villosity at the base of the stem, are often 
found at Neebish on sticks in coniferous woods. They represent 
L. ompJialodes Fr. 
Pileus 1-2 inches or more broad, thin, tough, deeply umbilicate 
and often pervious, repand or lobed, lacerate but not striate on the 
margin, pallid to fulvous, drying paler. Lamellae decurrent, 
broad, arcuate, pallid or whitish, tom and dentate on the edges. 
Stem 1-2 inches long, 1-3 lines thick, tough, flexuous, smooth, 
grooved and scrobiculate, concolorous with the pileus. Spores 
subglobose 4-6/a. Britzelmayr, 3-4 x 6/a. On buried sticks in coni¬ 
ferous woods. The European form is found also on the ground. 
(Compare under L. umbilicatus below.) 
Note 1. L. curtisii Sacc. & Cub. (L. omphalodes B & C.) differs only in 
that the gills are said to be entire. 
Note 2. L. micheneri B & C is a form of this species with the stem 
remarkably spongy-velutine at the base. 
4. Plate XXVI, A, B. Central-stemmed forms with even, smooth 
stems. The plants are smaller, the pilei more regular, and the 
stems more slender, smooth, and even than in the previous form. 
