370 Wisconsin Academy of Sciences , Arts , and Letters. 
2. Form with the pileus regular, orbicular, not splitting 
on the edge________—Plate XIX 
Related species. L. dunalii Fr. L. ravenelii B. & C. 
3. Form with the pileus irregular. Stems long and 
flexuous_______-Plates XX, XXI, A 
4. Form with a thick, short stem_Plate XXI, B-D 
III. Stem central. Pileus not scaly, gummy, resinous, or pul¬ 
verulent. The Lentinus adhaerens Group. 
1. L. adhaesus Britz_Plate XXI, E 
Related species. L. adhaerens Fr. L. resinaceus Fr. L. pulverulentus Fr. 
IV. Stem central or lateral, short, reddish brown mycelium at the 
base. Odor pleasant. The Lentinus suavissimus 
Group. 
1. Stem white with little or no red mycelium at the base 
(L. suavissimus Fr.)___Plate XXII, A-C 
2. Stem wholly reddish brown (L. haematopus Berk.) 
___Plate XXII, D-F 
Related species. L. anisatus P. Henn. L. odorus vill. L. jugis Fr. 
V. Plants typically irregular, clustered, with the stems concres- 
cent. The Lentinus cochleatus Group. 
1. Dense clusters of large plants_—Plate XXIII 
Related species. L. cochleatus var. occidentalis Bres. 
2. Dimidiate imbricated forms. (L. flabellifo'rmis Fr.) 
Plate XXIV 
Related species. L. piceinus Pk. 
3. Stem central grooved (L. omphalodes Fr.)-Plate XXV 
Related species. L. curtisii S. & C. L. micheneri B. & C. 
4. Stem central, smooth and even (L. umbilicatus Pk.) 
___Plate XXVI, A, B 
Related species. L. americanus Pk. 
5. Form with long, relatively thick, even stems, growing 
among moss_______-Plate XXVI, C 
VI. Large plants with dimidiate imbricated pilei the Lentinus 
ursinus—vulpinus Group. 
1. Pileus ridged and reticulated on the margin, corrugated 
behind (L. vulpinus Fr.)_,__—Plate XXVII 
2. Pileus even on the margin, coarsely pubescent behind 
(L. ursinus Fr.)_______Plate XXVIII 
Related species. L. pelliculosus Schw. L. castoreus Fr. L. pectinatus 
Schw. 
Note. L. sulcatus Berk., which appears to be the same as L. fulvidus 
Bres. and L. pholiotoides Ell. & Anders., is a rare plant and it is not 
certain to what group it belongs. 
