Abstract
A new species of Cyathus, C. setosus, of the Nidulariaceae, is described from Jamaica. The large brown-black cups are beset with long, durable setae. The fruit bodies are unusually thin-walled and very broadly conical. The nearest related species appear to be Lloyd's C. triples and C. nigro-albus, from each of which C. setosus is clearly separable.

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