Group C - Poroid Fungi with round or angular pores and more
than one layer of tubes

1. Inner substance (context) yellowish brown to darker brown or pinkish to reddish

    2. Inner substance rosy pink to pinkish brown...........................................................Rhodofomes cajanderi

    2. Inner substance yellowish-brown or darker brown

        3. Basidiocarp on various hosts (living or dead); basidiocarp flesh of equal hardness throughout,
            typically hard and woody; pore surface yellowish-brown to cinnamon-brown to reddish-brown
            to purplish-brown.

            4. Basidiocarp typically on living black locust (Robinia pseudoacacia); upper surface black,
                furrowed and cracked; pore surface yellowish to dull reddish-brown ................Phellinus robineae

            4. Note: A number of other Phellinus species and species in related genera will key out here. They are
                all members of the Hymenochaetaceae family. Because they can only be reliably separated from each
                other using microscopic characters, they are not included as individual species in the keys. Some of
                these species, however, are illustrated in a group I've called ..........................Phellinus and similar spp.

        3. Basidiocarp on various hardwood hosts (living or dead); upper surface covered with a hard crust
            below which the inner substance is softer; pore surface white or brown

            5. Basidiocarp hoof-shaped; pore surface brown, not bruising...........................Fomes fomentarius

            5. Basidiocarps flat; pore surface white, bruising dark brown

                6. Cap cuticle can be cracked/fractured ("crunched-in") by
                    pressing in with a thumb; new fruitbody produced
                    underneath previous season's fruitbody giving
                    appearence of a perennial fruitbody...... ........................................................Ganoderma lobatum

                6. Cap cuticle too hard to be cracked/fractured ("crunched-in")
                    by pressing in with a thumb; new layer of tubes produced
                    on same fruitbody as previous season, a true perennial species ..................Ganoderma applanatum   

1. Inner substance white or light-colored

    7. Upper surface reddish at first, becoming brownish or blackish, usually with persistent reddish, resinous (sticky)
        crust near the rounded margin; pore surface whitish to yellowish; occurring on conifers and hardwoods.
         ..................................................................................................................................Fomitopsis mounceae

        Note: Fomitopsis ochracea resembles F. mounceae in basic form and appearance but never has the
        reddish marginal band. Additional comments about F. ochracea are included on the F. mounceae page.

    7. Not as above

        8. Basidiocarp occurring on the stumps and at the base of living and dead conifers......Heterobasdion irregulare

        8. Basidiocarp occurring on hardwoods

            9. Basidiocarp white to cream, older specimens often with moss on top; on living hardwoods only,
                usually at the base of maple (Acer) ......................................................................Oxyporus populinus

            9. Basidiocarp with blackish, cracked and furrowed upper surface, pore surface light brown; occurring
                only on living or dead ash (Fraxinus); ..........................................................Perenniporia fraxinophila