1. LEPIDOPHLOIOS—AND ONTOGENY IN ARBORESCENT LYCOPODS
2. Lepidodendron johnsonii, sp. nov., from the Lower Pennsylvanian of Central Colorado;Arnold C. A.;Contrib. Mus. Paleontol. Univ. Mich.,1940
3. Observations on fossil plants from the Devonian of eastern North America. VI. Xenocladia medullosina Arnold;Arnold C. A.;Contrib. Mus. Paleontol. Univ. Mich.,1952
4. A lepidodendrid stem from Kansas and its bearing on the problem of cambium and phloem in Paleozoic lycopods;Arnold C. A.;Contrib. Mus. Paleontol. Univ. Mich.,1960