| SN2000 author citation | : | |
(A.G. Nathorst, 1902) E.W. Berry, 1920 |
| Original name & spelling | : | |
Nathorst, A.G. 1902. Kongl. Svenska Vetensk. Acad. Handl. 36 (3), 26 Aug 1902: 24. [unranked ("[Reihe] Calamariales und [Klasse] Sphenophyllales gleichwertigen Hauptgruppe")]. ≡ |
| Subsequent rank | : | |
Berry, E.W. 1920. Rep. (Annual) Board Regents Smithsonian Inst. 1918, 30 Jun 1920: 315. |