Nematasketum (sometimes incorrectly spelt nematosketum)[3][4] is a nematophyte with internally thickened tubes. It is thought to be terrestrial or freshwater,[2]
and seems to be aligned with the fungi.[5]
^Taylor, W. A.; Wellman, C. H. (2009). "Ultrastructure of Enigmatic Phytoclasts (Banded Tubes) from the Silurian-Lower Devonian: Evidence for Affinities and Role in Early Terrestrial Ecosystems". PALAIOS. 24 (3): 167–180. Bibcode:2009Palai..24..167T. doi:10.2110/palo.2008.p08-046r. S2CID85698193.
^ abBurgess, N. D.; Edwards, D. (1988). "A new Palaeozoic plant closely allied to Prototaxites Dawson". Botanical Journal of the Linnean Society. 97 (2): 189–203. doi:10.1111/j.1095-8339.1988.tb02461.x.