Group B - poroid fungi with a daedaloid or (in part) lamellate
Fertile Surface

1. Inner substance (context) of basidiocarp white or light colored (e.g., pale brown) or, if darker,
    then less than 1 mm thick.

    2. Basidiocarp occurring as large, complex cluster or rosette of large (often 10 cm or more broad),
        stemmed pilei ................................ ….........................................................Bondarzewia berkeleyi

    2. Basidiocarps not as above, not stemmed (sessile), simpler in structure

        3. Pore surface distinctly lamellate

            4. Upper surface glabrous; conspicuous concentric zones of various colors;
                radially striate; young pore surface bruises pinkish-brown;
                fruit bodies restricted to birch ..............................................................Daedaleopsis septentrionalis

            4. Upper surface velvety to hairy; multicolored concentric zones; not radially striate;
                young pore surface does not bruise pinkish-brown; fruit bodies on a variety of hardwoods
                especially birch, oak, and willow, sometimes conifers......................................... Lenzites betulinus

        3. Pore surface distinctly daedaloid or with a mix of daedaloid portions, radially elongated pores and
            lamellate portions. Note: Daedaloid portion restricted to outer margin of Cerrena unicolor.

            5. Pore openings 1-4 mm wide, tube walls about 1 (or more) mm thick; upper surface not typically
                zonate; occurring mostly on oak (Quercus) and chestnut (Castanea) ................. Daedalea quercina

            5. Pore openings 0.5-1.5 mm wide; tube walls less than 1 mm thick; upper surface often concentrically
                grooved (sulcate); on various hosts.

                6. Upper surface grayish to typically brownish, zonate; pore surface distinctly daedaloid; pore
                    surface whitish when young, brownish with age; young pore surfaces bruising pinkish-brown;
                    fruit bodies occurring on a wide variety of hardwoods
                    and conifers ............................................................................................ Daedaleopsis confragosa

                6. Fruit bodies not as above

                    7. Upper surface pubescent with coarse, elongated hairs; whitish to grayish to pale
                        brown, zonate, sometimes greenish when covered with algae; pore surface
                        with daedaloid marginal pores but otherwise mostly tooth-like.......................Cerrena unicolor

                    7. Upper surface glabrous or pubescent; mostly white to whitish to grayish, azonate or weakly
                        zonate, often covered with green algae from the base outward; pores whitish;
                        pores highly variable with circular to radially elongate pores, daedaloid pores, and
                        lamellate pores present from the base to the margin.........................................Trametes aesculi               

1. Inner substance (context) distinctly brown and more than 1 mm thick

    8. Basidiocarp less than 1 cm thick

        9. Upper surface hairy and zonate; on conifers only; pore surface golden-brown,
            mostly lamellate ............................................................................................Gloeophyllum sepiarium

        9. Upper surface glabrous, zonate; pores white to brownish, bruising pinkish-brown
            when young; on hardwoods

            10. Pore surface maze-like; fruit body occurring on a wide variety of hardwoods,
                        including birch (Betula spp.) ........................................................... Daedaleopsis confragosa

            10. Pore surface distinctly lamellate, fruit bodies restricted to birch .........Daedaleopsis septentrionalis

    8. Basidiocarp more than 1 cm thick

        11. Basidiocarp only on oak (Quercus) and chestnut (Castanea); pore openings 1-4 mm wide,
              pore walls 1-3 mm thick.....................................................................................Daedalea quercina

        11. Basidiocarp on a great variety of hardwoods; pore openings up to 1.5 mm in diameter,
              pore walls less than 1 mm thick; pores white to brownish, bruising pinkish-brown
              when young

              12. Pore surface maze-like; fruit body occurring on a wide variety of hardwoods,
                        including birch (Betula spp.) ........................................................... Daedaleopsis confragosa

              12. Pore surface distinctly lamellate, fruit bodies restricted to birch .........Daedaleopsis septentrionalis