Summary:
Datronia stereoides is distinguished in the field by the granulose (under a hand lens) walls of the small regular pale pinkish-buff pores, and the brown tomentum separated from the pale lower flesh by a black layer. Other features include a shelf-like form, a brown, non-zoned, upper surface that is tomentose to strigose, thin flesh, and microscopic characters.
Datronia stereoides has been found in BC, ID, AB, MB, AK, AZ, CA, CO, IA, IL MA, ME, MN, MO, MT, ND, NH, NY, VT, and WI, (Gilbertson). It is also known from SK (Ginns). It occurs in Europe, Asia, and Australia, (Breitenbach).
Cap:
bent out to form cap up to 1cm wide from pore surface lying flat on wood, or sometimes entirely flat, cap elongate or semicircular, annual; upper surface brown; usually azonate, tomentose to radially strigose (with coarse stiff appressed hairs), (Gilbertson), forming patches flat on wood with pore surface exposed, several centimeters to decimeters across, or forming shelf-like caps projecting 0.5-2cm, dark brown to blackish, narrowly zoned, and slightly tomentose; margin of pore surface distinctly bounded, whitish, (Breitenbach)
Flesh:
up to 0.2cm thick, lower part pale brown, separated from dark upper tomentum by a thin black layer, (Gilbertson), up to 0.1cm thick, ocher-brownish, (Breitenbach)
Pores:
4-5 per mm, circular to hexagonal, regular; pale pinkish buff; walls thick, entire, appearing granulose under 30x lens; tube layer up to 0.1cm thick, colored as flesh and continuous with it, (Gilbertson), 4-5(6) per mm, rounded; "gray-ocher to gray-brown, sometimes with slight pink tint, when fresh turning slightly brown when handled"; tube layer 0.1-0.2cm thick, (Breitenbach)
Microscopic:
spores 10-13 x 4.5-6 microns, cylindric, smooth, inamyloid, colorless; basidia 4-spored, 25-40 x 7-8.5 microns, clavate with a narrow base, with basal clamp; cystidioles not conspicuous or abundant, not projecting, 30-40 x 5-6 microns, fusoid; dendrohyphidia abundant on dissepiment edges, 1.5-2 microns wide, much branched and contorted; hyphal system dimitic: context generative hyphae 2-2.5 microns wide, thin-walled, nodose-septate, context skeletal hyphae 2-4 microns wide, thick-walled, aseptate, with frequent branching, those in lower context pale greenish brown in KOH, those in dark upper layer dark brown in KOH, trama hyphae similar to those in lower context, (Gilbertson), spores 9.5-12 x 3.5-4.5 microns, cylindric, smooth, inamyloid, colorless, with droplets, (Breitenbach)
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