Answers are grounded in this paper and cite their sources.
Alvan A. Karlin, Sheldon I. Guttman, Hybridization between Desmognathus fuscus and Desmognathus ochrophaeus (Amphibia: Urodela: Plethodontidae) in Northeastern Ohio and Northwestern Pennsylvania, Copeia, Vol. 1981, No. 2 (May 15, 1981), pp. 371-377
No takes yet. Share an insight, caveat, or question.
Karlin et al. (1981) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: