Doweld, A. B. (2016). (2423–2424) Proposals to conserve the names Ullmannia, with a conserved type, against Anthotypolithes and Cupressites and U. bronnii against Anthotypolithes ranunculiformis, Cupressus ullmannii and Cupressites bituminosus (fossil Gymnospermae: Voltziopsida). Taxon. 65(1): 190-191.
(2423–2424) Proposals to conserve the names Ullmannia, with a conserved type, against Anthotypolithes and Cupressites and U. bronnii against Anthotypolithes ranunculiformis, Cupressus ullmannii and Cupressites bituminosus (fossil Gymnospermae: Voltziopsida)