Summary:
Features include flat growth on dead Douglas-fir wood, cream to buff pores of irregular size, and microscopic characters that include distinctive contorted thick-walled hyphae in trama. The online Species Fungorum, accessed December 11, 2013 and April 18, 2020, gave the current name as Gilbertsonia angulopora but Mycobank, accessed on the latter date, listed it as Postia angulopora. The description is derived from Gilbertson(1) except where noted.

Microscopic:
spores 5.5-7 x 4-5 microns, broadly elliptic, smooth, inamyloid, colorless; basidia 4-spored, 25-40 x 7-10 microns, clavate, with basal clamp; cystidia absent; hyphae appearing dimitic, generative hyphae of trama 3-6 microns wide, thin-walled, some with frequent branching, with clamp connections, other hyphae in trama are thick-walled, firm-walled to almost solid, often contorted and lobed or branched, colorless, mostly 3-6 microns wide but with some inflated parts up to 10 microns wide, in lower subiculum and mycelial felts of decayed wood the thick-walled hyphae are more uniform, 2-4 microns wide, most with rare branching, (Gilbertson), generative hyphae 3-6 microns wide, binding hyphae of 2 types a) in the trama, 3-6 microns wide, some segments swollen to 10 microns wide, "contorted, frequently branched, the tips broadly rounded (not attenuated)", and b) in the context next to the tube layer and in mycelial felts in the wood, 2-4 microns wide, "infrequently branched, walls parallel, thick", (Ginns)

Notes:
Postia angulopora has been found in BC and OR.

Synonyms and Alternate Names:
Discina larryi McKnight
Discina leucoxantha Bres.