1. Abstracts 1985;Anon;Am. J. Bot.,1985
2. Studies in Paleobotany;Andrews,1961
3. The genus Callixylon from the Upper Devonian of central and western New York;Arnold;Pap. Mich. Acad. Sci. Arts Lett.,1930
4. A new Devonian lycopod genus from southeastern New York;Banks;Am. J. Bot.,1944
5. Floral assemblages in the Siluro-Devonian;Banks,1980