Rhyniophyta were among the first modern-style land plants, which seem to have been fully vacular (they used tubes to carry nutrients through their stems), and may have been direct descendants of cooksonia, the very first land plants thought to start to develop a vascular system. Artists impression of Cooksonia Cooksonia are an extinct genus of primative land plants. ...

Rhyniophyta lived mainly in the late Silurian and in the Devonian. They are thought to have been ancestors to most modern land plants. The Silurian is a major division of the geologic timescale that extends from the end of the Ordovician period, about 443. ... Disambiguation: Devonian is also an adjective relating to the English county of Devon or the people there. ...