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Rhynia gwynnevaughanii
http://www.xs4all.nl/~steurh/eng/rhynia.html
Transverse section of a stem.
Rhyniophyta
http://www2.ncsu.edu/unity/lockers/project/dendrology/index/plantae/vascular/vascular.html
Description and diagram of Rhynia, the first known vascular plant for which a complete fossil has been found.
The Oldest Land Plants
http://www.xs4all.nl/~steurh/eng/old2.html
Rhynie Chert.