Summary:
Features include 1) a shelf-like or bracket-like, fairly thick fruitbody that is gray to pale buff and hairy but not zoned, 2) a violaceous pore surface, and 3) growth only on aspen and cottonwood. The description is derived from Gilbertson(1).
In BC Trichaptum subchartaceum is known only from southwest of Fort Nelson and north of Valemont (Ginns). It has been found in BC, ID, AB, MB, YT, AK, AZ, CO, CT, ME, MN, MT, NM, NY, UT, WI, and WY, (Gilbertson).
Cap:
up to 6cm wide and 1cm thick, bent outward from pore surface flat on wood to form shelf-like cap, or bracket-like, dimidiate [roughly semicircular] to elongate, often laterally fused; gray to pale buff, hirsute [hairy] to appressed-strigose [with pressed down coarse hairs], not zoned; margin rounded
Flesh:
duplex: upper layer up to 0.2cm thick, soft, fibrous, not zoned, pale buff, lower layer up to 0.5cm thick, firm, corky, faintly zoned, pale buff
Pores:
3-4 per mm, circular to angular, walls at first thick, becoming thin and torn when old; "purple to violaceous or fading to pale buff"; tube layer up to 0.3cm thick, "violaceous or fading to buff"
Microscopic:
spores 7.5-11 x 2-3 microns, cylindric, slightly curved, smooth, inamyloid, colorless; basidia 4-spored, 18-25 x 5.5-7 microns, clavate, with basal clamp; cystidia abundant, 5-7 microns wide and projecting to 20 microns, cylindric, thin-walled to slightly thick-walled, apically incrusted, with basal clamp; hyphae dimitic, generative hyphae of context 2.5-3.5 microns wide, thin-walled, with clamp connections, skeletal hyphae of context 2.5-6 microns wide, colorless, thick-walled, nonseptate; hyphae of trama similar
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