Rhynia gwynnevaughanii - Transverse section of a stem. www.xs4all.nl/~steurh/eng/rhynia.html
Rhyniophyta - Description and diagram of Rhynia, the first known vascular plant for which a complete fossil has been found. www2.ncsu.edu/unity/lockers/project/dendrology/index/plantae/vascular/vascular.html
