TY - JOUR T1 - Studies in the Morphology of Spore-Producing Members. Preliminary Statement on the Equisetaceae and Psilotaceae JF - Proceedings of the Royal Society of London (1854-1905) VL - 53 SP - 19 EP - 22 PY - 1893/01/01/ UR - http://dx.doi.org/10.1098/rspl.1893.0004 M3 - doi:10.1098/rspl.1893.0004 AU - Bower, F. ER -