Summary:
Antrodia albida is characterized by flat to shelf-like growth on hardwood, white pores that vary from pore-like to gill-like, a white shelving cap that is matted to velvety and becomes zonate, and large spores. The description is derived from Gilbertson(1), except where noted.

Microscopic:
spores 10-14 x 3.5-5 microns, cylindric, "often rather variable within the same collection, presumably due to a variable number of sterigmata", inamyloid, colorless; basidia 15-22 x 6-9 microns, clavate, with basal clamp connection; no cystidia or other sterile elements, hyphal system "dimitic, generative hyphae with clamps, in the context and parts of the trama, thin to distinctly thick-walled, 2-5 microns wide, in the subhymenium thin-walled and mostly 2-4 microns wide, skeletal hyphae thick-walled to almost solid, hyaline, unbranched to rarely dichotomously branched, 3-6 microns wide"

Spore Deposit:
white (Buczacki)

Notes:
It is found in BC, WA, OR, ID, NB, ON, PQ, YT, AK, AL, AR, AZ, CA, CT, DE, FL, GA, IA, IL, IN, KS, KY, LA, MA, MD, ME, MI, MO, MS, MT, NC, NE, NH, NJ, NM, NY, OH, PA, SC, TN, TX, VA, VT, WI, and WV, (Gilbertson).

Synonyms and Alternate Names:
Daedalea albida Fr.
Daedalea serpens Fr.
Trametes sepium Berk.