Summary: Features include flat or shelf-like often imbricate growth on conifer wood, with individuals up to 10cm long and 3cm wide, an upper surface that is whitish, zonate, and tomentose to smooth, pores that are angular to labyrinth-like and whitish, and large spores. The description is derived from Gilbertson(1).
Microscopic: spores 10-13 x 5-7 microns, cylindric to oblong elliptic, often slightly curved near apiculus, inamyloid, colorless; basidia 30-40 x 9-11 microns, clavate, with basal clamp; cystidia none: "occasional pointed cystidioles may occur between the basidia, but their presence is variable"; hyphal system dimitic, generative hyphae 2-4 microns wide, thin-walled to thick-walled with abundant clamp connections, skeletal hyphae 3-7 microns wide, thick-walled to semisolid, straight to sinuous and with occasional dichotomous branching
Notes: Antrodia heteromorpha has been found in BC, WA, OR, ID, AB, NB, NS, ON, PQ, YT, AK, AL, AZ, CA, CO, MA or RI, ME, MI, MN, MO, MT, NC, NH, NM, NY, PA, SD, TN, UT, VA, VT, WI, and WY, and it is widely distributed in north Europe and northern Asia, (Gilbertson).
Habitat and Range
SIMILAR SPECIES
Antrodia albida may occur on conifer wood, but its spores in general are narrower, (Gilbertson). Brunneoporus juniperinus has smaller spores (Gilbertson as Antrodia).
Habitat
annual, on conifer wood, occasionally on hardwood, causes a brown cubical rot in conifer wood