Basionym Name:Pterygium coerulescens Harm., Lich. Fr. 1: 18 (1905)
Homotypic synonyms:Placynthium coerulescens (Harm.) Gyeln., Annls Mus. natn. Hung., Pars bot. 22: 198 (1939)Placynthium subradiatum f. coerulescens (Harm.) Henssen, Can. J. Bot. 41: 1699 (1963)