Accepted as Tyromyces falcatus.
The description by Cunningham of macroscopic characters is satisfactory, but there are misleading statements about the microscopic characters. The septa of the generative hyphae are not simple, but have large, conspicuous clamps. The basidiocarp is composed of mostly unbranched hyphae with very thick walls. These vegetative hyphae were described by Cunningham as binding hyphae but appear in the illustration (Cunningham, 1965: fig. 28) as skeletal hyphae. We interpret them as skeletal hyphae with scattered side-branches, the side-branches not being as common or regular as described by Cunningham. The thick hyphal walls often appear to be multilayered and are refractive in KOH. T. falcatus has a harder texture than most other species in Tyromyces.

Holotype: PDD 15612 - New Zealand, Westland, Ahaura, Orwell Creek, Apr. 1955, J.M. Dingley, on Nothofagus fusca (Hook. f.) Oerst.