Summary:
Features include flat growth on wood, a pinkish or flesh-colored pore surface that darkens on drying, horny consistency of the dried fruitbody, and microscopic characters. Wu(2) proposed a name in Physisporinus based on a reorganization of genera with molecular evidence. MycoBank, accessed August 30, 2018 gives the current name of Rigidoporus crocatus (Pat.) Ryvarden as Physisporinus crocatus (Pat.) F. Wu, Jia J. Chen & Y.C. Dai, but the online Species Fungorum, accessed the same day, gives that name as a synonym of Rigidoporus crocatus (Pat.) Ryvarden. The description is derived from Gilbertson(1).

Microscopic:
spores 3.5-5.5 x 3.5-5 microns, oval to nearly round, smooth, inamyloid, colorless; basidia 4-spored, 17-20 x 10-12 microns, broadly clavate, simple-septate at base; cystidia absent; hyphae monomitic, hyphae of subiculum 3-8.5 microns wide, thin-walled to thick-walled, simple-septate, gelatinizing on drying and difficult to separate, hyphae of trama 3-4 microns, similar

Notes:
Rigidoporus crocatus has been found in BC, WA, ID, NS, AK, AR, AZ, CA, FL, LA, MN, MT, NC, NM, NY, PA, SC, TN, VA, and WV, (Gilbertson).

Synonyms and Alternate Names:
Cristinia gallica (Pilat) Julich
Cristinia mucida (Bourdot & Galzin) J. Erikss. & Ryvarden
Poria crocata Pat.
Poria nigrescens Bres.