group of organisms (fossil)
The Nematophytes are a paraphyletic group of land organisms, probably including some plants as well as algae. They are known only from the fossil record, from the Silurian period until the early Devonian Rhynie chert.
- Smith M.R. & Butterfield N.J. 2013. A new view on Nematothallus: coralline red algae from the Silurian of Gotland. Palaeontology 56 (2): 345–357. 
- Niklas K.J. 1976. Chemical examinations of some non-vascular Paleozoic plants. Brittonia 28 (1): 113–137. 
- Fayers, Stephen R. & Trewin, Nigel H. 2003. A review of the palaeoenvironments and biota of the Windyfield chert. Transactions of the Royal Society of Edinburgh: Earth Sciences 94 (4).