Class II. Key to Pore-bearing Fungi (Polyporei)
| 1. | Pores readily separating from cap, spores whitish or brownish, | Boletus. |
| 2. | Stems strictly lateral, pores in the form of tubes, mouths are separate from each other (growing on wood), | Fistulina. |
| 3. | Tubes not separable from each other, round, angular, or torn, fleshy, leathery or woody, | Polyporus. |
(Key to species of Boleti may be found in Professor Peck’s work on Boleti.)