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Page number:86 
Remarks (internal):The generic circumscription is interpreted in various ways. Originally the genus was described as monomitic and this was followed by Stalpers (1998), but Nakasone (2001) described the hyphal system as dimitic since it included microbinding hyphae. R. casearius (Morgan) Ryvarden (not known from South America) was found by Nakasone (2001) to have clamp-connections in contradiction to Ryvarden (1972) and Gilbertson (1964).
The South American distribution of Radulodon is somewhat unclear and only three species are known viz.: R. americanus Ryvarden (possibly from Brazil), R. venustus Hjortstam & Ryvarden (Brazil and Colombia) and the new species below.
 
Description type:Non-original description 
Description:Radulodon Ryvarden, Can. J. Bot. 50:2073, 1972.
Generic type: Radulodon americanus Ryvarden
Basidiomes resupinate, usually pale, effused, adnate, hydnoid, aculei usually 1-3 mm long, but in some species up to 15 µm long or more, cylindrical or flattened. Subiculum pale, mainly thin. Hyphal system monomitic; hyphae thin-walled or with a slight wall thickening, all hyphae with clamp-connections. Cystidia lacking or present, thin-walled, more or less tubular. Basidia with four sterigmata and a basal clamp-connection. Spores globose to subglobose, smooth, moderately thick-walled, rarely thin-walled, inamyloid, indextrinoid, acyanophilous.
 
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