Words Quoted
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- Dijkstra , S. J. 1946 . Eine Monographische Bearbeitung der karbonischen Megasporen, mit besonderer berüksichtigung von Südlimburg (Niederlande) . Meded. geol. Sticht, Maastricht (C) , III ( 1 ) : 1 – 101 . pls. i.–xvi.
- Kubart , B. 1910 . Denkschrift K. Akad. Wissen., Wien , lxxxv : 83 – 88 .
- Hirmer . 1927 . Handbuch der Palaobotanik Vol. I , Munich and Berlin
- Schopf , J. M. 1938 . Spores from the Herrin (No. 6) Coal Bed in Illinois . Rep. Investig. Illinois Geol. Surv., Urbana , 1 : 1 – 73 . pls. i.–viii.
- Schopf , J. M. , Wilson , L. R. and Bentall , R. 1944 . An Annotated Synopsis of Palæozoic Fossil Spores, and the Definition of Generic Groups . Rep. Investig. Illinois Geol. Surv., Urbana , xci : 1 – 72 . pls. i.–iii.
- Scott , D. H. 1898 . On the Structure and Affinities of Fossil Plants from the Palæozoic Rocks.—II. On Spencerites, a new genus of Lycopodiaceous Cones from the Coal Measures, founded on the Lepidodendron spenceri of Williamson . Phil. Trans. Roy. Soc. Lond. (B) , clxxxix : 83 – 106 . pls. xii.–xv.
- Scott , D. H. 1920 . Fossil Botany , 3rd edn. London
- Walton , J. 1931 . The Absence of Eligulate Heterosporous Lycopodiales in the Fossil-Record . Proc. Roy. Soc. Edinb. , li ( 2 ) : 114 – 115 .
- Williamson , W. C. 1878 . On the Organisation of the Fossil Plants of the Coal Measures, Part IX . Phil. Trans. Roy. Soc. Lond. , clxix ( 2 ) : 319 – 364 . pls. xix.—xxv.
- Williamson , W. C. 1893 . On the Organisation of the Fossil Plants of the Coal Measures . Phil. Trans. Roy. Soc. Lond. , : 17 – 17 . Part xix1893
- Wilson , L. R. and Coe , E. A. 1940 . Description of Some Unassigned Plant Microfossils, from the Des Moines Series of Iowa . Amer. Midl. Nat. , xxiii : 182 – 185 . pl. i
- Zeller , R. 1888 . Bassin Houiller de Valenciennes. Description de la flore fossile . Etudes des Gîtes Minéraux France , : 731 – 731 . atlas, xciv. pls. Paris
- Zerndt , J. 1934 . Les Mégaspores du Bassin Houiller Polonais, Pt. I . Acad. Polon. Sci. Lett. Com. Publ. Silésiennes, Trav. Géol. , i : 1 – 56 . pls. i.–xxxii.