parichnos
/pəˈrɪknɒs/Botany
noun
A strand of parenchymatous tissue accompanying a leaf trace, found in fossil lycopods of the order Lepidodendrales and, in vestigial form, as canals in some living lycopods, especially of the genus Isoetes (quillworts).
Origin
Late 19th century; earliest use found in Proceedings of the Royal Society of London. From French parichnos from para- + ancient Greek ἴχνος track, trace.