Group A - Poroid fungi with Tubes that break up to Form
toothlike structures

1. Pore surface with purple or violet coloration at least near the margin

    2. Growing on coniferous wood, cap rarely more than 1 cm wide...............................Trichaptum abietinum

    2. Growing on hardwoods, cap up to 7 cm wide.........................................................Trichaptum biforme

1. Pore surface without purple or violet tones

    3. Caplike portion of effused-reflexed (sometimes entirely resupinate) basidiocarp less than 1 cm long,
        all parts white to cream-colored .....................................................................................Irpex lacteus

    3. Caplike portion of sessile or effused-reflexed basidiocarp more than 1 cm long, whitish or not

        4. Pileus zonate, margin not radially striate; upper surface white to gray to pale brown but may
            be greenish due to algae; pores whitish when young, ashy grey to smoky with age; thin dark line
            in context below the pubescence of the cap surface ................................................Cerrena unicolor

        4. Pileus azonate or faintly zonate, margin radially striate; upper surface creamy white to
            yellowish buff; pores cream to yellowish buff; no thin dark line in context below the
            pubescence of the cap surface .............................................................................Trametes pubescens