Summary:
Features include tough perennial or persistent fruitbodies growing flat on hardwood with the pore surface exposed, the color varying from grayish to bright yellow, and microscopic characters including thick-walled dextrinoid spores and dextrinoid skeletal and binding hyphae.
Perenniporia medulla-panis has been found in BC, WA, OR, ID, AL, AR, AZ, CA, CO, DE, GA, KY, LA, MD, MI, MO, MT, NC, NM, NY, PA, SC, VA, and WV, (Gilbertson). In BC, it is known from three collections (Ginns).
Cap:
usually growing flat on wood with pores exposed, sometimes narrowly bent back to form cap on vertical surfaces, tough-corky in consistency, (Gilbertson), growing flat on wood with pores exposed, 20-30cm across, on vertical surfaces with small knot-like rudimentary caps; margin of pore surface sharply bounded, somewhat lighter in color, sometimes detached from wood, (Breitenbach)
Flesh:
subiculum thin, cream to yellowish, (Gilbertson)
Pores:
5-7 per mm, circular, variable in color: cinereous [ash-gray], cream to cream-buff or bright yellow; thick walls, tube layers distinctly layered, each layer up to 0.1cm thick, colored as subiculum, (Gilbertson), 4-6 per mm, rounded; whitish cream to ocherish; tube layers each 0.1-0.5cm thick, (Breitenbach)
Taste:
bitter (Breitenbach)
Microscopic:
spores 5-6.5 x 3-4 microns, broadly elliptic to oval, usually truncate, smooth, weakly to strongly dextrinoid, colorless, thick-walled; basidia 4-spored, 19-27 x 7-11 microns, broadly clavate with narrow base, with basal clamp; cystidia none, cystidioles not projecting 15-22 x 7-8 microns, fusoid, with basal clamp, hyphal pegs present; hyphal system trimitic: subiculum generative hyphae 2-4 microns wide, thin-walled, with clamp connections, subiculum skeletal hyphae 2.5-5 microns wide, thick-walled, nonseptate, binding hyphae 1.5-2 microns wide, thick-walled, nonseptate, much-branched, skeletal and binding hyphae dextrinoid, trama hyphae similar, (Gilbertson), spores 5-6.5 x 3.5-5 microns, broadly oval, truncate, smooth, inamyloid, pale yellow, thick-walled, (Breitenbach)
Spore Deposit:
pale yellow (Buczacki)
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