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.
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).
Fruiting body:
resupinate, adnate [firmly attached to substrate], hydnaceous, the teeth 0.1-0.5cm long, often fused at the base, smooth or slightly fimbriate [fringed] to finely dentate along the edges and in the apices, ochraceous to pale buff, cartilaginous, "when dry with clusters or slender semipyramids of fused teeth"; subiculum up to 0.2cm thick, white, when dry cracking, (Ryvarden)
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)
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