Summary:
Features include 1) resupinate growth on Populus species, 2) a spore-bearing surface with teeth up to 0.5cm long, often fused at the base, smooth or slightly fringed to finely dentate along the edges and at the tips, ochraceous to pale buff, cartilaginous, 3), a subiculum up to 0.2cm thick, cracking, 4) spores that are round to nearly round, smooth, inamyloid, and colorless, 5) absent cystidia, and 6) hyphae with clamp connections. The true Radulon casearium (Morgan) Ryvarden was known only from the type specimen by 1972, and reports of it were misidentified specimens of Radulon americanus.

Microscopic:
SPORES 4-6.5 microns in diameter, round to nearly round, smooth, inamyloid, colorless; BASIDIA 4-spored, 20-40 x 5-10 microns, suburniform, sterigmata 2-5 microns long, basally curved; CYSTIDIA none; HYPHAE 1.5-4.5 microns wide, colorless, with clamp connections, (Ryvarden)

Notes:
Radulodon americanus has been found in BC, ID, AB, MB, NB, NS, NT, ON, PQ, SK, AZ, CO, MI, MN, MT, NH, NY, and WI, (Ginns). It is apparently restricted to North America (Ryvarden).

Synonyms and Alternate Names:
Amyloporiella oleracea (R.W. Davidson & Lombard) A. David
Poria oleracea R.W. Davidson & Lombard
Radulum casearium Aucts.