dictyostele
noun
dic·tyo·stele ˈdik-tē-ə-ˌstēl 
ˌdik-tē-ə-ˈstē-lē
ˌdik-tē-ə-ˈstē-lē : a stele in which the vascular cylinder is broken up into a longitudinal series or network of vascular strands around a central pith (as in many ferns)
Word History
Etymology
dictyo- + stele
Note: Term apparently introduced by the Scottish-born botanist George Brebner (ca. 1855-1904) in "On the Anatomy of Danaea and other Marattiaceae," Annals of Botany, no. 62 (September, 1902), vol. 16, p. 520.
First Known Use
circa 1902, in the meaning defined above