Harper—Species of Lentinus in Great Lakes Region. 369 
attachment of the pilens to the substratum. The divisions are 
Mesopus, Pleuropus, Merisma, Apus, Reflexo-resupinati, and Re- 
supinati, according as the stem or attachment is central, lateral, 
branching, or dorsal. Lentinus and related genera are poorly 
adapted to this classification. The tough and pliable substance 
readily adapts itself to circumstances, and the position, on the top, 
side, or underneath a log, erumpent from a crack or from under 
bark, gives a great variety of form to the carpophores of the same 
species. Forms belonging to more than one of Fries’ sections are 
found in each group. In the Lentinus cochleatus group repre¬ 
sentatives of all the sections may be found. Murrill uses these 
sections for the division of the genus into genera in the North 
American Flora, which places plants belonging to the same group 
in different genera. For example, L. cochleatus and umbilicatus 
are scarcely more than habitat forms but are placed in widely 
separated genera. Emphasis must be laid on the fruiting bodies, 
the nature of the tissue, and other phylogenetic characters in de¬ 
termining the groups, and especially must there be large familiarity 
with the plants as they grow in different localities and positions. 
Synopsis of the Species 
I. Stem central. Scales large, appressed, spot-like. The Lentinus 
lepideus group. 
1. Annulate form_-Plate XIV, A-C 
2. Exannulate form_Plate XIV, D, E 
3. Form with decurrent lamellae and long slender stem 
(L. spretus Pk.) _Plate XV, A 
Related species. L. hornotinus Fr. 
4. Form with an obconic pileus and long stem (L. obconi- 
cus Pk.) ____„__Plate XV, B 
Related species. L. suffrutescens Fr. 
5. Large plants growing on the ground (similar to L. mag- 
nus Pk.)___Plate XVI 
Related species. L. maximus Johnson. 
6. Form with finely furfuraceous stem_Plate XVII, A 
7. Form growing from a sclerotium___Plate XVII, B 
II. Stem central. Scales of the pileus small, fibrous, tufted. The 
Lentinus tigrinus Group. 
1. Form with the pileus thin, • irregular, splitting on the 
edge ______Plate XVIII 
24—S. A. L. 
