Icacinicarya reticulata produced a thick-walled, rather inflated fruit stone whose surface architecture differs from the ordinary raised-ridge reticula of many London Clay fruits. A network of substantial fibres or vascular strands is partly embedded within the wall, creating a reticulate appearance over a subglobose endocarp. The marginal primary vascular bundle itself lies outside the wall.

The endocarp anatomy confirms an icacinaceous fruit, but its unusual fibre network has not yielded a secure match to a living genus. Comparisons have been made with Icacina-like fruits, yet the modern revision kept it in Icacinicarya rather than treating that resemblance as proof. The parent plant was certainly an angiosperm and probably woody at family level, but no attached vegetative organs show whether it was a tree, shrub or climber.